Configure Postfix to Send Mail Using an External SMTP Server

There are many reasons why you would want to configure Postfix to send email using an external SMTP provider such as Google Apps (Gmail), Mandrill, SendGrid, Amazon SES, or any other SMTP server. One reason is to avoid getting your mail flagged as spam if your current server’s IP has been added to a spam list. In this tutorial, you will learn how to install and configure a Postfix server to send email through Google Apps, Mandrill, or SendGrid. Prerequisites Before starting this tutorial, you should have: Debian 7 installed on your Linode Your fully qualified domain name (FQDN) All updates installed : 1 sudo apt-get update A valid username and password for the SMTP mail provider, such as Google Apps, Mandrill,...

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Posted in: Postfix

Use Telnet to test SMTP communication on Exchange servers(Copy: https://technet.microsoft.com/en-us/library/bb123686(v=exchg.160).aspx)

Exchange 2016 Other Versions   Applies to: Exchange Server 2016 Topic Last Modified: 2016-08-09 Learn how to use Telnet to test SMTP connectivity and mail flow on Exchange servers. You can use Telnet to test Simple Mail Transfer Protocol (SMTP) communication between messaging servers. SMTP is the protocol that's used to send email messages from one messaging server to another. Using Telnet can be helpful if you're having trouble sending or receiving messages because you can manually send SMTP commands to a messaging server. In return, the server will reply with responses that would be returned in a typical connection. These results can...

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Posted in: Chec Mail,Exchange,Lotus Dominino,Lotus Notes