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https://docs.microsoft.com/en-us/Exchange/mail-flow/test-smtp-with-telnet
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.
https://practical365.com/exchange-server/how-to-send-email-via-telnet/
Aug 10, 2011 · This is one of the essential troubleshooting tricks that an Exchange administrator needs to know, sending an email using Telnet from the command line. Let's say you've just configured a relay connector and want to test it from the server that you wish to allow relay from before you let that server's owner know that it is all set up for them.
https://www.dell.com/support/article/en-us/sln285793/how-to-test-an-email-server-with-the-telnet-client
Note: While it is recommended to perform this test from a mail server (in other words, install the Telnet client on your local mail server and use it to connect to a remote one) in order to closely simulate real-world email delivery, it is also possible to install the Telnet client on a Windows client OS, such as Windows 7, by using the Programs and Features Control Panel applet.
https://www.sparkpost.com/blog/how-to-check-an-smtp-connection-with-a-manual-telnet-session/
Feb 07, 2020 · It is important to note that if a mail server supports PIPELINING, as mail.port25.com does, the SMTP mail server may wait until the DATA command is issued before responding to any other commands after the EHLO / HELO.. In this case, enter the MAIL FROM, RCPT TO, and DATA commands before waiting for a response. Now that the DATA command has been sent we can start …
http://www.cryer.co.uk/brian/msexchange/exch_use_telnet_to_test_email_delivery.htm
You can use telnet (the command line utility) to test whether your email (SMTP) server is receiving emails. You can also use it to test that your server is not an open-relay. To send an email using telnet. Open the command prompt (Typically Start > run > cmd) type: telnet mail.server 25. where "mail.server" is the name of your mail server. This ...
https://blog.mailtrap.io/how-to-test-smtp-server/
Jul 26, 2016 · The MAIL FROM command is going to be the next to issue. This command defines the address to which bounces are delivered. The “From” header is not the similar thing (the email address shown in an email client). MAIL FROM: <[email protected]> 250 2.1.0 MAIL ok We can send the RCPT TO command now that we the MAIL FROM command was sent.
https://www.netadmintools.com/telnet-smtp-test
Recipient ok data 354 Enter mail, end with "." on a line by itself Subject: test message this is a test. 250 2.0.0 h5CH6GVI015806 Message accepted for delivery quit 221 2.0.0 mx.yourmailserver.com closing connection Connection closed by foreign host. u-1@srv-1 u-1 $
https://help.netmail.com/display/KB/How+to+use+Telnet+to+Send+a+Test+Message+and+Verify+SMTP+Communication
This article describes how to telnet to the Netmail Secure server on Port 25 (the default SMTP port) to test and troubleshoot SMTP communication problems. This procedure quickly tests whether the Netmail Secure server can receive mail messages and queue them for delivery.
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