Re: Emails failing to be delivered Error code: The error that the other server returned was: 554 554 5.
May 17, 2012 12:26 PM
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: Composing and Sending Messages
: Mozilla Firefox
Have you configured gmail to send your email through an external smtp server (via the "accounts and import" tab of gmail settings)? If so, it looks like your external smtp server no longer wants to take your mail.