Smtp errors

SMTP protocol is responsible for e-mail sending. SMTP errors mean that e-mails have not been sent. Every message contains an error code by which the problem and ways of its solving can be figured out. The most widespread errors are listed below.

Error 451. Requested action aborted: local error in processing

Error 450 Requested mail action not taken: mailbox unavailable

Error 501. Syntax error in parameters or arguments

Error 503.Bad sequence of commands or this mail server requires authentication

Error 552. The Recipient’s mailbox cannot receive messages this big

Error 550 Mailbox unavailable

Error 554 Transaction failed

Error 504.Command parameter not implemented

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