Jetzt habe ich mir mal die Zeit genommen das RFC raus zu suchen, in denen die SMTP reject codes definiert sind.

    guckst Du hier: rfc2821

    4.2.3  Reply Codes in Numeric Order
          211 System status, or system help reply
          214 Help message
             (Information on how to use the receiver or the meaning of a
             particular non-standard command; this reply is useful only
             to the human user)
          220 <domain> Service ready
          221 <domain> Service closing transmission channel
          250 Requested mail action okay, completed
          251 User not local; will forward to <forward-path>
             (See section 3.4)
          252 Cannot VRFY user, but will accept message and attempt
             (See section 3.5.3)
          354 Start mail input; end with <CRLF>.<CRLF>
          421 <domain> Service not available, closing transmission channel
             (This may be a reply to any command if the service knows it
             must shut down)
          450 Requested mail action not taken: mailbox unavailable
             (e.g., mailbox busy)
          451 Requested action aborted: local error in processing
          452 Requested action not taken: insufficient system storage
          500 Syntax error, command unrecognized
             (This may include errors such as command line too long)
          501 Syntax error in parameters or arguments
          502 Command not implemented (see section 4.2.4)
          503 Bad sequence of commands
          504 Command parameter not implemented
          550 Requested action not taken: mailbox unavailable
             (e.g., mailbox not found, no access, or command rejected
             for policy reasons)
          551 User not local; please try <forward-path>
             (See section 3.4)
          552 Requested mail action aborted: exceeded storage allocation
          553 Requested action not taken: mailbox name not allowed
             (e.g., mailbox syntax incorrect)
          554 Transaction failed  (Or, in the case of a connection-opening
              response, "No SMTP service here")

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