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 Error: 535 5.7.0 - Authentication Failed

Given as response to OUTGOING mailCould be caused by wrong user/password 1. Double check username...

 Error: 450 4.0.0 - Your IP address has been restricted due to heavy usage

Your IP address has been restricted due to heavy usage. Enable SMTP authentication in your email...

 Error: 550 5.7.1 - This message does not comply with required standards

This error is given when the message has gone over the threshold for spam score.The message is...

 Error: 550 5.0.0 - H:DAD or H:MXB Connection Refused due to Abuse

These are new systems designed to reduce the overall amount of spam we receive, as well as reduce...

 How to Read Email Headers & Check for Time Delays

Email Header 1. X-Spam-Flag: NO2. X-Authenticated-User: mail.domain.com3. X-Envelope-From:...