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https://serversmtp.com/smtp-error/
46 rows · Contact your SMTP service provider to fix the situation. 500. A syntax error: the server couldn’t recognize the command. It may be caused by a bad interaction of the server with your firewall or antivirus. Read carefully their instructions to solve it. 501. Another syntax error, not in the command but in its parameters or arguments.
https://www.socketlabs.com/blog/what-does-smtp-error-mean/
SMTP 200 Response Codes. 220 – The SMTP server is ready; 221 – The SMTP server is closing its transmission channel; 250 – The requested action taken and completed (Good news!) SMTP 300 Response Codes. A code starting with 3 indicates the request is understood, but the server is going to need more information to complete the task. 334 ...
https://www.iana.org/assignments/smtp-enhanced-status-codes/smtp-enhanced-status-codes.xhtml
82 rows · Simple Mail Transfer Protocol (SMTP) Enhanced Status Codes Registry Created 2008-05 …
https://www.socketlabs.com/blog/21-smtp-response-codes-that-you-need-to-know/
The following 500 SMTP response codes are some of the most important SMTP response codes that you need to be aware of. 17) 550 — The requested command failed because the user’s mailbox was unavailable for example because it was not found, or because the command was rejected for policy reasons.In addition, SMTP response code 550 is also ...
https://support.google.com/a/answer/3221692?hl=en
The status codes provide additional information. Each digit in these codes carry their own precise meaning: the first digit denotes the code class, the second digit indicates the subject, and the third digit provides more detail.
https://www.cox.com/business/support/common-error-messages-for-returned-email.html
14 rows · View descriptions of many of the common email errors that a customer may receive when …
https://support.microsoft.com/en-us/help/256321/enhanced-status-codes-for-delivery-rfc-1893
Apr 19, 2018 · 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. New subject and detail codes will be added over time.
https://community-mimecast.force.com/s/article/Mimecast-SMTP-Error-Codes-842605754
When messages are sent or received between two email servers or Mail Transfer Agents (MTAs), the communication uses a series of numeric SMTP codes. These codes are always in pairs, which means both servers transmit the codes until either the conversation is successful, or fails.
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-1-1-through-5-1-20-in-exchange-online
I got this bounce message. How do I fix it? Here are some steps that you can try to fix the problem yourself. If the steps in this section don't fix the problem for you, contact your email admin and refer them to the information in this topic so they can try to resolve the issue for you.
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