ESMTP commands – EHLO, RSET, MAIL, RCPT and more.

December 11, 2023

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/docs/security/email-security-appliance/214630-esmtp-commands-supported-by-the-esa-ces.pdf

About the HELO command:
https://www.ibm.com/docs/en/zos/2.2.0?topic=sc-helo-command-identify-domain-name-sending-host-smtp

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#esmtp #smtp #cisco #esa #email #emailsecurity #secureemailgateway #ces #cloud #cloudemail #helo #ehlo #mail #rcpt #vrfy #rset

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Tags upcoming, kindly ignore:
———————————————–
EHLO, HELO, MAIL FROM, RCPT TO, DATA
QUIT, RSET, VRFY, EXPN, HELP
NOOP, STARTTLS, AUTH, EHLO domain, HELO hostname
MAIL FROM: email address, RCPT TO: recipient address
DATA message, QUIT command, RSET command
VRFY username, EXPN list, HELP command, NOOP command
STARTTLS encryption, AUTH LOGIN, AUTH PLAIN, AUTH CRAM-MD5
AUTH LOGIN username, AUTH PLAIN credentials
AUTH CRAM-MD5 challenge/response, SMTP server, SMTP client
SMTP session, SMTP protocol, SMTP commands
ESMTP extension, ESMTP server capabilities
ESMTP authentication, ESMTP encryption, ESMTP EHLO response
ESMTP 250 OK response, ESMTP 550 error, ESMTP 554 error
SMTP header, SMTP body, SMTP relay, SMTP bounce
SMTP delivery, SMTP troubleshooting
SMTP authentication methods
SMTP banner
SMTP conversation
SMTP handshake
SMTP message format
SMTP envelope
SMTP reply codes
SMTP relay server
SMTP forwarder
SMTP header fields
SMTP timeouts
SMTP server response
SMTP server errors
SMTP client configuration
SMTP server configuration
SMTP security
SMTP TLS handshake
SMTP session logging
SMTP sender policy framework (SPF)
SMTP domain keys identified mail (DKIM)
SMTP content filtering
SMTP blacklisting
SMTP whitelisting
SMTP graylisting
SMTP rate limiting
SMTP mail queue
SMTP delivery status notification (DSN)
SMTP relay access control
SMTP multi-part messages
SMTP line length limits
SMTP message size limits
SMTP mail delivery protocols (POP3, IMAP)
SMTP reverse DNS lookup
SMTP reverse-path validation
SMTP message authentication
SMTP mail filtering rules
SMTP message submission
SMTP mail routing
SMTP email forwarding
SMTP bounce-back messages
SMTP message relaying
SMTP sender verification
SMTP recipient verification
SMTP message tracking
SMTP mail delivery delay
SMTP mail headers analysis
SMTP email delivery troubleshooting
SMTP mail server security
SMTP server performance tuning
SMTP client libraries
SMTP server software
SMTP client software
SMTP compliance standards
SMTP server logs
SMTP message queuing algorithms