0 Success
2 xp_startsmtp failed.
3 xp_stopsmtp failed.
5 xp_sendmail failed.
12 Attachment not found.
15 Insufficient memory.
20 Unknown recipient.
25 Mail session failed to start.
100 Socket error.
Antivirus software may have blocked the outbound connection to the SMTP server.
Check the "SMTP Server:" field.
101 Socket timeout.
102 Unable to resolve the SMTP server hostname.
103 Unable to connect to the SMTP server.
104 Server error; response not understood.
Check the "SMTP Server:" field.
105 A TLS error occurred.
Check the "SMTP Authorization User Name:", "SMTP Authorization Password:" and "SMTP Certificate Filespec:" fields.
421 Domain service not available, closing transmission channel.
450 Requested mail action not taken: mailbox unavailable.
451 Requested action not taken: local error in processing. Message may have been rejected as spam.
452 Requested action not taken: insufficient system storage.
500 Syntax error, command unrecognized. (This may include errors such as a command that is too long).
501 Syntax error in parameters or arguments.
502 Command not implemented.
503 Bad sequence of commands.
504 Command parameter not implemented.
511 Bad email address.
550 Requested action not taken: mailbox unavailable. For example, the mailbox is not found, there is no access, or no relay is allowed.
551 User not local; please try forward-path.
552 Request mail action aborted: exceeded storage allocation.
553 Requested action not taken: mailbox name not allowed. For example, the mailbox syntax is incorrect.
554 Transaction failed.
The message may have been rejected as spam.