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http://www.iana.org/assignments/smtp-enhanced-status-codes/smtp-enhanced-status-codes.xhtml
82 rows · The mail delivery protocol status codes report failures involving the message delivery protocol. These failures include the full range of problems resulting from implementation errors or an unreliable connection. ... This status code is returned when an SMTP client's IP address failed a reverse DNS validation check, contrary to local policy ...
https://support.microsoft.com/en-us/help/256321/enhanced-status-codes-for-delivery-rfc-1893
Apr 19, 2018 · The codes space defined is intended to be extensible only by standards track documents. Mail system specific status codes should be mapped as close as possible to the standard status codes. Servers should send only defined, registered status codes. System specific errors and diagnostics should be carried by means other than status codes.
https://serversmtp.com/smtp-error/
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https://www.usps.org/info/smtp_status.html
This status code is returned when an SMTP client's IP address failed a reverse DNS validation check, contrary to local policy requirements. X.7.26 Multiple authentication checks failed - Code: 550 This status code is returned when a message failed more than one message authentication check, contrary to local policy requirements.
https://help.emarsys.com/hc/en-us/articles/115004730749-SMTP-Status-Codes
The traditional SMTP bounce codes are three-digit numbers (e.g., 550). The enhanced bounce codes are three-digits separated by decimal points (e.g., 5.1.1). The tables below are not a definitive list of all available bounce codes, only a representation of the most frequent ones.
https://tools.ietf.org/html/rfc3463
RFC 3463 Enhanced Mail System Status Codes January 2003 1.Overview There is a need for a standard mechanism for the reporting of mail system errors richer than the limited set offered by SMTP and the system specific text descriptions sent in mail messages. There is a pressing need for a rich machine-readable, human language independent status code for use in delivery status notifications [].Author: G. Vaudreuil
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