smtp tests

What are Common SMTP Errors?

Common SMTP errors include:
421 Service Not Available: The mail server is temporarily unavailable.
450 Requested Mail Action Not Taken: The mailbox is unavailable, often due to being busy or temporarily locked.
550 Requested Action Not Taken: The mailbox is not found or the recipient domain is incorrect.
554 Transaction Failed: The email was rejected, often due to spam filters or blacklisting.
Understanding these errors can help you troubleshoot and resolve issues more efficiently.

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