Mar 22, 2019 · When you receive the message, open it and click “ show original .”. The message headers will be displayed. By reading the original message, we can validate our SPF and DKIM settings. If you can see “ PASS ” in the SPF line as shown in the image, it means that the setting is correct. However, if the header indicates “ FAIL ” as in ...4 days ago · Envía campañas de email marketing y emails masivos sin complicaciones ¡Crea tu cuenta gratuita ahora y aprovecha el mayor volumen gratis de internet!Sep 28, 2018 · An SMTP relay server (also called mail relay server or mail transfer agent) is an SMTP server, which enables an SMTP relay.This means that it accepts e-mails from a sender and forwards them to any …Mar 8, 2024 · An email server is a system responsible for receiving, sending and storing emails. It works as an intermediary between the user who sends the email and the user who receives it, thus ensuring the effective transmission of messages between them. An email server is, in essence, software installed on a server connected to the internet.May 2, 2017 · Add Authentication (Optional) If the SMTP relay requires authentication then do the following steps. Change to mail configuration directory. cd /etc/mail. Create /etc/mail/authinfo. vim /etc/mail/authinfo. Add a plain text line with SMTP FQDN and Credentials. Replace smtp.domain.com, USERNAME and PASSWORD.3 days ago · Add a new relayhost. Go to the Routing tab of the Configuration and Details section of the admin UI. Here you will see a list of relayhosts currently setup. Scroll to the Add sender-dependent transport section. Under Host, add the host you want to relay to. Example: if you want to use Mailgun to send emails instead of your server IP, enter smtp ...That is why the CRA, in partnership with the Canadian Administrator of Video Relay Service (CAV), has introduced new dedicated phone lines, with …An open relay is an improperly configured Simple Transfer Mail Protocol (SMTP) server allowing the unauthorized relay of email. Spammers can connect to the server and use it to send email while forging the sender information of the messages. Some blocklists actively target open relays to block the abusive practices of spammers who use these ...SimpleLogin lets you create and manage email aliases (relays) that forward your emails to any address you choose, while keeping your real email address private …Aug 31, 2023 · Private Relay uses a single, secure connection to maintain privacy and performance. This design may impact how throughput is reflected in network speed tests that typically open several simultaneous connections to deliver the highest possible result. While some speed test measurements may appear lower when Private Relay is enabled, your actual ... An outgoing relay is a mail server that delivers users' outgoing email messages. If you use separate email clients such as Outlook, Apple Mail, or Thunderbird, or if you access email on a mobile device, you will need to set up an outgoing relay for your University email account. Mailrelay is an easy and efficient tool that has saved us a lot of time and internal IT and commercial resources that weused to have to consume. It allows us toadapt predesigned templates to our corporate style and we can send mailings with personalized fields instantly. It has helpedus with our client relationships. Nov 4, 2003 · In /etc/mail/sendmail.cf file look for DS macro by /^DS and infront of DS entry put your mail relay domain name. Like this: DSyourmailrelayserver.domanname save and quit and restart the sendmail by /sbin/init.d/sendmail stop and /sbin/init.d/sendmail start Look for log file for the status of every mail in /var/adm/syslog/mail.log file Good luck ...1 day ago · The Relay Visa® Debit Card is issued by Thread Bank pursuant to a license from Visa U.S.A. Inc. and may be used everywhere Visa® debit cards are accepted. 1 The interest rates and annual percentage yield on your account are accurate as of 05/16/23 and are variable and subject to change based on the target range of the Federal Funds rate. APY ...Dec 27, 2022 · An SMTP relay is an email relay service that routes high volumes of email messages through SMTP servers so they don’t end up in the spam folder. A relay, or mail relay, describes the zig-zag process of passing an email from one email server to another until it reaches the recipient. Mar 12, 2020 · A mail relay server aka SMTP Relay Server is an SMTP server that enables the SMTP relay. So this mail transfer agent accepts all the e-mails from a sender and then forwards them to some third party. In most of the cases, there will be an external third-party server connected between the STMP servers of the sender and recipient. ...Free SMTP server to power your emails. As one of the world's leading email service providers, Mailjet's robust delivery infrastructure routes billions of emails to the inbox every month. Easily set up our free SMTP server in minutes and discover how our platform will help you send your emails faster. Get Started. Get A Custom Email Plan.Reliable email delivery with industry-leading SMTP services. With Mailgun’s SMTP relay services, senders around the world can send both marketing and transactional emails alike without needing to manage their own mail servers. Count on our SMTP services to send both marketing and transactional emails without needing to manage your own mail ...Even after all these years, email still remains one of the best sources of communication for any IT organization. When it comes to bulk email delivery, a mail relay is an easy and effective way to solve the spam and security issues inherent with outgoing email servers. An open mail relay is a Simple Transfer Mail Protocol (SMTP) server, which is improperly …The only greater annoyance than junk email is junk postal mail. Not only does it clog your mailbox, but it wastes an awful lot of paper. Luckily, you can cut down on this junk. He...Tell PHP to use a remote host ... As Windows PCs don't have a mail server on them you need to tell PHP to relay email via a remote server. Amend ...Mar 19, 2024 · Simple Mail Transfer Protocol (SMTP) is a straightforward process that allows users to send, relay, and monitor outgoing emails.SMTP relay service—also commonly known as SMTP gateway service—takes this as a step further by allowing you to send, receive and transfer more transaction and marketing-related emails.Se você precisa atrair novos clientes com sua próxima promoção ou se comunicar de forma confiável com seus clientes existentes, a Mailrelay é sua melhor escolha. Crie sua conta gratuita. Suporte técnico incluso em todas as contas. Sempre com um toque humano. Comece agora em 3 passos simples. Estatísticas avançadas. …4 days ago · Envía campañas de email marketing y emails masivos sin complicaciones ¡Crea tu cuenta gratuita ahora y aprovecha el mayor volumen gratis de internet!Sep 18, 2022 · So let’s complete it a little bit to understand its purpose. “Email marketing is the action of sending persuasive messages via email to connect with an audience and provoke a response from them. The goal is to generate more awareness, trust, engagement, and customer satisfaction and loyalty.May 2, 2017 · Add Authentication (Optional) If the SMTP relay requires authentication then do the following steps. Change to mail configuration directory. cd /etc/mail. Create /etc/mail/authinfo. vim /etc/mail/authinfo. Add a plain text line with SMTP FQDN and Credentials. Replace smtp.domain.com, USERNAME and PASSWORD.Aug 24, 2021 · An SMTP (Simple Mail Transfer Protocol) relay is a service that allows the transmission of email messages from one mail server to another. An easy way to understand what an SMTP relay service does is to imagine an Olympic relay race: your email message ( a transactional email or promotional/marketing email ) is the baton, and the runners are ... Yahoo Mail has been a popular email service for many years, and it is important to know how to manage your account properly. Here are some tips and tricks to help you get the most ...As one of the world's leading email service providers, Mailjet's robust delivery infrastructure routes billions of emails to the inbox every month. Easily set up our …Source. What is SMTP? SMTP, or Simple Mail Transfer Protocol, is a set of rules defined for sending emails from one sender’s email server to the recipient’s …Jan 19, 2021 · Step 1: Setting up Postfix SMTP Relay on Ubuntu. First, let’s install Postfix SMTP server on Ubuntu with the following command. If Postfix is already running on your server, then skip installing Postfix, …Feb 21, 2023 · If you want EOP or Exchange Online to relay email from your email servers to the internet, either: Use a certificate configured with a subject name that matches an accepted domain in Microsoft 365 or Office 365. We recommend that your certificate's common name or subject alternative name matches the primary SMTP domain for your organization. 1. An SMTP relay provider offers you the sending infrastructure. Internet Service Providers (ISPs) assess the reputation of your domain and IP address to determine whether your emails will reach recipients’ inboxes or end up in the spam folder. A smart host SMTP service adds your company’s domain to the list of trusted senders, thus ... What is mail relay? Mail relay is the act of transferring an email from one server to another for delivery. When one company sends to another, say Company A and Company B, Company A's server connects to Company B's server, which relays the email. An SMTP server accepting mail from another SMTP server is called "relaying." May 29, 2001 · 第一部分 mail relay 规则详解 一.软件环境：Sendmail 8.9.3至8.12 二. 默认情况下的relay规则 在默认情况下,也就是安装完系统(Sendmail服务器)不做任何设置的情况下,则只能在 本机上收发邮件, 网络上(局域网或Internet)的任何其它主机不能向该SMTP服务器发 送邮件,若希望能实现发送,则需满足下面的任何一 Mailrelay is an easy and efficient tool that has saved us a lot of time and internal IT and commercial resources that weused to have to consume. It allows us toadapt predesigned templates to our corporate style and we can send mailings with personalized fields instantly. It has helpedus with our client relationships. Sep 28, 2018 · An SMTP relay server (also called mail relay server or mail transfer agent) is an SMTP server, which enables an SMTP relay. This means that it accepts e-mails from a sender and forwards them to any third party. In most cases, this is an external third-party server on the internet that is connected between the sender and recipient STMP servers ... Mar 4, 2022 · Then tap iCloud and Private Relay (Beta) and flip the toggle green to turn it on. iPhone or iPad. Go to Settings > Apple ID > iCloud > iCloud Private Relay. Toggle on iCloud Private Relay (Beta ...3 days ago · Simple Mail Transfer Protocol. The SMTP server protocol is a simple protocol for sending, relaying, and monitoring outgoing emails. An SMTP relay service also called an SMTP gateway service, extends this by allowing you to send additional transactional and marketing-related emails, Instead of maintaining your own program’s logistics.4 days ago · Envía campañas de email marketing y emails masivos sin complicaciones ¡Crea tu cuenta gratuita ahora y aprovecha el mayor volumen gratis de internet!Nov 4, 2003 ... Re: how to i config mail relay in hp-ux 11.11. Put the entry of your relay server in /etc/hosts. Modify /etc/mail/sendmail.cf and modify DS ...Learn how to set up your on-premise email server for SMTP relay through Google servers to filter messages for spam and viruses, apply email security and …Even after all these years, email still remains one of the best sources of communication for any IT organization. When it comes to bulk email delivery, a mail relay is an easy and effective way to solve the spam and security issues inherent with outgoing email servers. An open mail relay is a Simple Transfer Mail Protocol (SMTP) server, which is improperly …Mar 21, 2023 · All messages sent from my on-premises servers must relay through Microsoft 365 or Office 365 to the internet. And I need to point my domain's MX record to my on-premises server. ... For the best mail flow experience (especially for spam filtering) we recommend pointing the MX record for your organization's domain to Microsoft 365 or …Sep 5, 2019 · Go to Start –> Run and type in inetmgr6 and hit Enter. This will open the IIS 6 console. Once the console is open, right-click on [SMTP Virtual Server #1] (1), then select Properties (2). Checking SMTP Virtual Server properties. In the Properties window, check Enable logging (1), then click Properties (2).Jan 1, 2022 ... make sure all ports are opened for SMTP to connect to it from mailcow as relay later (simple telnet command would help); after you done ... Free SMTP server to power your emails. As one of the world's leading email service providers, Mailjet's robust delivery infrastructure routes billions of emails to the inbox every month. Easily set up our free SMTP server in minutes and discover how our platform will help you send your emails faster. Get Started. Get A Custom Email Plan. Mar 21, 2023 · All messages sent from my on-premises servers must relay through Microsoft 365 or Office 365 to the internet. And I need to point my domain's MX record to my on-premises server. ... For the best mail flow experience (especially for spam filtering) we recommend pointing the MX record for your organization's domain to Microsoft 365 or …Mar 19, 2024 · Simple Mail Transfer Protocol (SMTP) is a straightforward process that allows users to send, relay, and monitor outgoing emails.SMTP relay service—also commonly known as SMTP gateway service—takes this as a step further by allowing you to send, receive and transfer more transaction and marketing-related emails.This might work for your case. It's worth a shot if you haven't tried it already. Make sure to whitelist the external IP that the emails will come from, ...Creating a new Yahoo Mail account is easy and only takes a few steps. With a Yahoo Mail account, you can access all of the features of the Yahoo Mail service, including email, cont...Dec 6, 2023 · Mozilla Firefox. Firefox 出品. 可在 Android™ 版 Firefox 上使用. Firefox Relay lets you generate email aliases that forward to your real inbox. Use it to hide your real email address and protect yourself from hackers and unwanted mail. 您需要 Firefox 来使用此扩展. 下载 Firefox 并安装扩展. 下载文件. 214,090. E-MailRelay will then serve up e-mail messages from a sub-directory of the main spool directory, with the sub-directory name being just the name that the POP client uses to authenticate. To get the e-mail message files into the --pop-by-name sub-directory a filter script can be used. This should just copy the new envelope file and content file ... Sep 8, 2021 · Make (previously Integromat) is a no-code, visual integration platform that lets you connect Mailrelay with any online apps or APIs to automate and optimize your workflows. Create automation sequences with email and marketing services, e-commerce platforms, calendars, CRM tools, and more. Save time and improve efficiency using …Turn iCloud Private Relay on or off on your Wi-Fi or Ethernet network. On your Mac, choose Apple menu > System Settings, then click Network in the sidebar. (You may need to scroll down.) Open Network settings for me. Do one of the following: Click Wi-Fi on the right, then click Details next to the name of the network.May 15, 2022 · Bạn muốn sử dụng Zimbra làm mail server cho doanh nghiệp của bạn, nhưng bạn không muốn phải quản lý và bảo mật mail server? Bạn có thể cấu hình Zimbra để sử dụng mail relay, tức là chuyển tiếp các email gửi đi qua một mail server khác, có thể là một dịch vụ mail chuyên nghiệp như Gmail, Zoho, Sendgrid, v.v. Trong bài ...Feb 23, 2024 · Early access to loads and discounts on fuel, tires, maintenance, and more. Short-term contracts and auctions allow me to find dependable work for my drivers that I know will get them back home. Amazon Relay has something for everybody. The great thing about Relay Load Board is I can search for a load quickly, originating anywhere in the US.Jun 9, 2008 · 什么是邮件转发(mail relay)技巧管理员(2000-12-24 10:18)〖返回〗〖转发〗设置好一个email服务器以后，该服务器将具有一个或若干个域名，这时email服务器将监听25号端口，等待远程的发送邮件的请求。网络上其他的mail服务器或者请求发送邮件的MUA(Mail User Agent,如outlook express、foxmail等等)会连Your SMTP relay limit can be reset once each day based on a rolling 24 hour period. You can use a maximum of 500 SMTP relays, per day, per email account.An open relay is an improperly configured Simple Transfer Mail Protocol (SMTP) server allowing the unauthorized relay of email. Spammers can connect to the server and use it to send email while forging the sender information of the messages. Some blocklists actively target open relays to block the abusive practices of spammers who use these ... · To associate your repository with the smtp-relay topic, visit your repo's landing page and select "manage topics." GitHub is where people build software. More than 100 million people use GitHub to discover, fork, and contribute to over 420 million projects.Jan 5, 2024 · On November 1, 2023, the matching condition for the SMTP P2 sender domain is removed. The following are the new requirements for relaying email through Exchange Online: Any of the following is an accepted domain of your organization, if: SMTP certificate domain on the SMTP connection; or. SMTP envelope sender domain in the … Send 100 emails/day free forever. SendGrid is the world's largest email infrastructure as a service provider. We send over 100 billion non-spam emails a month for over 80,000 paying customers including technology leaders like AirBnB, Spotify, and Uber. Sep 5, 2013 · 若在qmail系统中使用vpopmail，则可以利用vpopmail专门针对漫游用户的配置选项来实现防止邮件系统的relay功能被滥用。. 若希望支持漫游用户通过邮件服务器的转发邮件 (mail relay)，则需要在安装vpopmail时使用如下配置选项：. [root@aidmail vpopmail-4.9.4]# ./configure --enable ...Login to Office 365 portal. Access OWA (Mail) client. In the top menu click on the Settings icon. Choose the Options menu. On the left side menu bar choose the POP and IMAP menu. in the bottom of the page, click on the Settings for POP or IMAP. In the windows that appear, look for the section: SMTP settings.Jul 20, 2018 · SMTP2GO. SMTP2GO provides an external SMTP relay service at a competitive rate and integrates with most mail service providers. It is a solution to those emails that continue to arrive to the spam folder and will lift any annoying ISP sending limits. SMTP2GO has a knowledgeable support team that you can reach 24 hours a day. 3 days ago · Add a new relayhost. Go to the Routing tab of the Configuration and Details section of the admin UI. Here you will see a list of relayhosts currently setup. Scroll to the Add sender-dependent transport section. Under Host, add the host you want to relay to. Example: if you want to use Mailgun to send emails instead of your server IP, enter smtp ...Nov 12, 2021 · Open the Exchange Admin Center. Log in add your Exchange Admin Center and navigate to: Mail flow > Connectors. Create a new Connector. Click on Add a connector to create a new connector. and choose Your organization’s email server. Connector name. Give the connector a recognizable name and leave the selected options on. Nov 23, 2021 · Go to Mail flow > Connectors in the navigation pane to open Office 365 SMTP relay settings. In my example, the list is empty because no connectors have been created yet. If you have previously created connectors, they should appear on this page. Click + Add a connector on the Connectors page to add an SMTP connector.Learn how to set up a multifunction device or application to send emails using SMTP AUTH client submission, direct send, or SMTP relay. … Email relay set up. This process might differ from provider to provider, but this is the general procedure for most free open SMTP relay emails. To set up your SMTP relay server, all you have to do is add and validate your domain name. You choose between a dedicated and shared IP address and then follow the on-screen instructions. 2 days ago · Email API features. Send reliably at scale with SMTP service—no servers required. Expedite troubleshooting with searchable email activity feed and additional history.*. Increase delivery rates with Email Validation API. Collaborate across teams and measure success with an intuitive user interface.3 days ago · Simple Mail Transfer Protocol. The SMTP server protocol is a simple protocol for sending, relaying, and monitoring outgoing emails. An SMTP relay service also called an SMTP gateway service, extends this by allowing you to send additional transactional and marketing-related emails, Instead of maintaining your own program’s logistics. Send 100 emails/day free forever. SendGrid is the world's largest email infrastructure as a service provider. We send over 100 billion non-spam emails a month for over 80,000 paying customers including technology leaders like AirBnB, Spotify, and Uber. Apr 18, 2023 · To set up SMTP Relay on Windows 10, first, open the Control Panel by typing “Control Panel” in the search bar or pressing Win + X then selecting Control Panel. From there, select “Programs” followed by “Turn Windows features on or off.”. Next, scroll down to find the option for “SMTP Server.”.Dec 30, 2019 ... Email transport · Check your smtp relay logs, if there is something… · Check if your smtp relay support STARTTLS. Connect to smtp relay from ...Jan 1, 2022 ... make sure all ports are opened for SMTP to connect to it from mailcow as relay later (simple telnet command would help); after you done ... Build exceptional customer experiences. Integrate and deliver in minutes with our RESTful APIs or SMTP relay services. Access comprehensive documentation, open source libraries in 7 languages, and a clear setup flow to help you send right away. Integrate with our feature-rich mail/send API. Plug into our SMTP relay service for standardized sending. Dec 27, 2022 · An SMTP relay is an email relay service that routes high volumes of email messages through SMTP servers so they don’t end up in the spam folder. A relay, or mail relay, describes the zig-zag process of passing an email from one email server to another until it reaches the recipient. There are two types of mail relays: open and closed. An open mail relay routes mail from external sources as well as internal server mail. This type of relay is is ripe for abuse from …An SMTP relay or Message Transfer Agent (MTA) transfers emails from one mail server to another. When an email is sent, the initial message sends the details of the route with a destination address to the SMTP relay. The relay uses the Domain Name Service (DNS) and domain address from the email to determine the destination ID.Nov 4, 2003 · In /etc/mail/sendmail.cf file look for DS macro by /^DS and infront of DS entry put your mail relay domain name. Like this: DSyourmailrelayserver.domanname save and quit and restart the sendmail by /sbin/init.d/sendmail stop and /sbin/init.d/sendmail start Look for log file for the status of every mail in /var/adm/syslog/mail.log file Good luck ...An SMTP relay is a protocol that enables the sending and delivery of emails over the Internet, from one SMTP server to another. This protocol was established in 1982 and continues to be a widely used standard even today. In the past, an SMTP relay server consisted of an SMTP server that allowed sending emails without authentication to the ...Learn how to set up a multifunction device or application to send emails using SMTP AUTH client submission, direct send, or SMTP relay. …Mar 13, 2024 · Mailrelay is an advanced email marketing platform with powerful features. It allows you to create, send and manage your newsletters providing complete subscriber behaviour statistics. ניתן לדמות את מערכות סינון המייל (Mail Relay) למכונת שטיפה שפעילה: מייל יוצא מלקוח קצה ונשלח אליך לתיבת הדוא"ל. המייל מתקבל בשרת ה-Mail Realy. המייל עובר בדיקת סינון אנטי-וירוס ואנטי-ספאם. הקבצים ... Mar 1, 2012 · Send mail to another self-hosted account: Mail gets marked as Spam. 5.7.1 < [email protected] >: Relay access denied. I've set all of the DNS records for SPF, dmarc, ... as pointed out in the documentation, but still rspamd marks my mails either as spam, or doesn't allow sending them to external mail accounts.1 day ago · The Relay Visa® Debit Card is issued by Thread Bank pursuant to a license from Visa U.S.A. Inc. and may be used everywhere Visa® debit cards are accepted. 1 The interest rates and annual percentage yield on your account are accurate as of 05/16/23 and are variable and subject to change based on the target range of the Federal Funds rate. …In my environment I have both a web server, and then an e-mail server (Exchange). I successfully setup OsTicket and had a successful installation. However, when ...
In addition to its web app, Yahoo! Mail offers a mobile application that allows you to manage your small business’s Yahoo email account on the go. Whether your business works with .... Clarance house
Mar 14, 2024 · Relay Hosts Introduction. Rather than having Postfix deliver mail directly, you can configure Postfix to send mail via another mail relay (smarthost). Examples include Mailgun, Sendgrid and AWS SES. Depending on the domain of the sender, you may want to send via a different relay, or authenticate in a different way. Basic ConfigurationMar 21, 2023 · In Microsoft 365 and Office 365 mail flow, there are several components of DNS that are particularly important for email authentication and delivery: MX records, SPF, DKIM, and DMARC. MX (mail exchanger) records provide an easy way for mail servers to know where to send email. You can think of the MX record as a type of postal address. When it comes to heating systems, maximizing comfort and savings is a top priority for homeowners. One effective way to achieve this is by using Erie Boiler Zone Relay controls. Be...The SMTP relay is a more specific form of SMTP server which is solely responsible for routing emails from one incoming SMTP server to another. Unlike an SMTP server, the relay service focuses simply on identifying nearest SMTP servers and routing messages to them. The SMTP server, on the other hand, is typically also responsible for directing ...This might work for your case. It's worth a shot if you haven't tried it already. Make sure to whitelist the external IP that the emails will come from, ...Some of the top quartermilers from India took part in the National Open Relay Carnival 2024 held at the Sector 7 Sports Complex in Chandigarh on …Nov 7, 2014 ... The fix was simple, just untick Authentication required under the SMTP relay settings page, click ok to apply the settings change and then tick ...Open mail relay. Open mail relay is also known as insecure or third-party relay. This is the service an SMTP server provider offers. This means that emails from both your internal and external networks are sent on your behalf by this third party. The opposite is closed mail relay. This is where only internal messages are sent.Jul 17, 2007 · 什么是邮件转发 (mail relay) 设置好一个email服务器以后， 该服务器将具有一个或若干个域名，这时email服务器将监听25号端口，等待远程的发送邮件的请求。. 网络上其他的mail服务器或者请求发送邮件的MUA (Mail User Agent,如outlook express、foxmail等等)会连接email服务器的 ...Queqiao-2 will take over from the ageing Queqiao-1, launched in 2018. Queqiao-1, which is a third as massive as Queqiao-2, was the first relay satellite …The answer is mailRelay! Our fast and reliable outbound mail SMTP relay service integrates with your existing Exchange or SMTP server, typically only requiring a few minutes to configure it to send mail via our ‘smarthost’. The service is provided via Dual Data centres located within the UK to ensure the highest levels of availability and ...Queqiao-2 will take over from the ageing Queqiao-1, launched in 2018. Queqiao-1, which is a third as massive as Queqiao-2, was the first relay satellite …SMTP Relay Free For Startups And Small Businesses. Mail SMTP relay services come in paid or free versions. The choice of an SMTP service is the prerogative of the enterprise. Small businesses or companies handle low …Nov 4, 2003 ... Re: how to i config mail relay in hp-ux 11.11. Put the entry of your relay server in /etc/hosts. Modify /etc/mail/sendmail.cf and modify DS ...Some of the top quartermilers from India took part in the National Open Relay Carnival 2024 held at the Sector 7 Sports Complex in Chandigarh on …Aug 24, 2021 · An SMTP (Simple Mail Transfer Protocol) relay is a service that allows the transmission of email messages from one mail server to another. An easy way to understand what an SMTP relay service does is to imagine an Olympic relay race: your email message ( a transactional email or promotional/marketing email ) is the baton, and the runners are ... .