Tuesday, 4 November 2014

Email bounce back with Return Code 451

[Return Code 451] sid: Ve9e1o0012Rj2se01 :: Sorry, I wasn’t able to establish an SMTP connection. I’m not going to try again; this message has been in the queue too long.
 Typically, 451 errors are due to the receiving server rejecting your email. This can happen for a number of reasons but most likely is due to the recipients server being overloaded with messages. It can also mean that the recipients server has grey-listed the IP, and therefore delays the message until it can verify that the sending server is not trying to send spam. The receiving server may be offline as well.

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