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SMTP Error 510

Category: Other
Tags: # # #

Description: Invalid email address.

What does this mean?

This response is straight forward. One of the email addresses in the ‘TO:’, ‘CC:’, or ‘BCC:’ is incorrect (invalid).

How to fix SMTP Error 510?

Check all email addresses in your message, including (‘TO:’, ‘CC:’, and/or ‘BCC:’), for any misspelling.