552 5.2.0 ESMTP server not available AUP#O-1450
Does anyone have any information about the above error code?
Solved! Go to Solution.
" A 552 email error is typically encountered when there is a problem related to an attachment in your email. Either it has exceeded the size limits of the remote server, or the file-type isn't allowed by the remote server. Some mail servers also seem to use this error code incorrectly when blocking a message due to triggering a filter such as a URL in the message being found in a domain black list. "
Spectrum Social Media Customer Care