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Asked: 2026-06-14T19:16:55+00:00

I’m working on a windows based server and I am wondering why a server

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I’m working on a windows based server and I am wondering why a server would return this error message when using the mail() function:

Warning: mail() [function.mail]: SMTP server response: 554 Invalid From address:
xxxxx@MyDomain.com. Could not find domain MyDomain.com on our servers.
The email From address must be of type any_valid_name@yourdomain.com in 
\\web-123win\winpackage22\MyDomain\web\content\mail.php on line 16

I mean, isn’t the mail() function supposed to send emails to whatever domain we want?

Can you help me in the understanding of this message? thanks

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1 Answer

  1. Editorial Team

    Since spam become the 99% of all e-mail traffic most mail servers no longer accept all mail they’re handed. Instead, they only accept messages from these categories:

    • Incoming mail for their users
    • Outcoming mail from their users

    Your mail appears to belong to the second category so you must provide a proof of identify so they know you’re allowed to user their mail system. The details depend on the mail provider but you’re normally required to provide a username and password.

    Said that, mail() function does not implement authentication so you need to use a third-party package like PHPMailer or Swift Mailer.

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