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SMTP Error 503


Bad sequence of commands

What does this mean?

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.

How to fix SMTP Error 503

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.

Similar SMTP Errors

email/troubleshooting/error-numbers/503.txt · Last modified: 2020/06/12 10:38 by Karson N.