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Editorial Team
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Asked: 2026-05-24T13:51:38+00:00

OK, so I have a PHP mail function. It works fine when I put

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OK, so I have a PHP mail function. It works fine when I put it on my server but when I put I mail it to my client so he can put it on his server it doesn’t work. It doesn’t give me any errors on their server and gets to the “Thanks” page just fine but never really sends the email. They say it’s because PHP Mail does not have the right headers but I didn’t think that it needed headers if it was just simply “mail(to, subject, message)” They say they have all PHP related functions set properly because I initially thought it was PHP Mail being turned off.

Any suggestions would be great.

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1 Answer

  1. Editorial Team

    You should always be using a “FROM” header.

    Note:

    When sending mail, the mail must contain a From header. This can be
    set with the additional_headers parameter, or a default can be set in
    php.ini.

    Failing to do this will result in an error message similar to Warning:
    mail(): “sendmail_from” not set in php.ini or custom “From:” header
    missing. The From header sets also Return-Path under Windows.

    This is straight from the documentation for mail()

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