SMTP Error 503

Description:

Bad sequence of commands

This is also very similar to Error # 501. The small difference in this, is due to the parameters or options being out of order from what the mail server expected. This is commonly seen when not authenticating the email account.

Check to make sure that the email account is authenticating properly (if required which it should!.) If properly authenticating, ensure all MTA configurations are set properly.

# 501