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![What is An SMTP Relay? [A Brief Crash Course] | SocketLabs](https://www.socketlabs.com/wp-content/uploads/2019/04/smtp-server.png "What is An SMTP Relay? [A Brief Crash Course] | SocketLabs")
What is An SMTP Relay? [A Brief Crash Course] | SocketLabs
linux - Configure Backup Mail Relay in Postfix - Stack Overflow
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Linux Send Monitoring Alert Emails without Mail Server via relay SMTP with ssmtp / msmtp - ☩ Walking in Light with Christ - Faith, Computing, Diary
