ESMTP Commands - RSET, VRFY, EHLO, MAIL FROM, RCPT TO, DATA, etc
The ESMTP commands are used by mail servers while communicating with the other mail servers for sending emails.
These commands are extremely useful while testing out connection issues, or email delivery issues.
You can find details about the same in a nutshell in the following link:
https://www.cisco.com/c/en/us/support...
About the HELO command:
https://www.ibm.com/docs/en/zos/2.2.0...
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