SMTP Error 455

Description: Server unable to accommodate parameters.

What does this mean?

If for some reason the server is temporarily unable to accomodate one or more of the parameters associated with a MAIL FROM or RCPT TO command, and if the definition of the specific parameter does not mandate the use of another code, it should return code 455.

How to fix SMTP Error 455?

Allow some time for ‘retries’. If unsuccessful, contact the recipient mail server’s administrator.