550 dkim encountered the following problem validating
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Almost always, when you get an email bounced back (or inserted in your mail log!
) with a 550 error code, it means that the receiving system could not deliver your email to the user to whom it was addressed because the mailbox is unavailable.
Anybody who sends email has seen them, in one form or another – those SMTP error codes, often returned in bounced email, such as “550 Requested action not taken: mailbox unavailable” or “550 5 2 1 mail from refused spam site.” These are often in response to SMTP commands that have ‘gone wrong’ between your email server that sent the email, and the receiving email server that is unable to deliver it (or refuses to deliver it) for some reason. Unfortunately, many receiving systems seem to mix and match these error messages, rather than adhering to the prescribed code messages.