The server has meets the bad sequence of commands or it is require an authentication.

Causes

The parameters or options are being out of order from what the mail server expected

• Normally will see this when the email account has not yet been authenticated

Fixes

Step 1: Email Address Is Authenticated

Check to ensure the email address is authenticated properly.

Step 2: Ensure MTA Configurations Perfect

Ensure all MTA configurations is at the best possible settings.