SMTP Error Codes

SMTP is an acronym for Simple Mail Transfer Protocol. It is a protocol for sending email messages between servers. SMTP error codes generally mean that there was a problem with the SMTP server or the mail client.

Wikipedia: List of SMTP server return codes
SMTPEDIA: The Complete SMTP Error Codes list: Understanding Why That Error Happened & How to Fix It 101

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Last updated on August 2, 2024