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Editorial Team
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Asked: 2026-06-12T12:20:13+00:00

I have a problem with my PHPMailer class. There is a form with file

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I have a problem with my PHPMailer class.
There is a form with file upload functionality. The file uploads fine with no errors.
But I get the following output from the script:

Could not instantiate mail function. Unable to send message to * @ *.com

This happens only with the attachments of more than several megabytes. My php.ini configuration is fine:

post_max_size = 50M

upload_max_filesize = 50M

When I get this value below the actual upload size, then the page just refreshes and nothing happens. With the following values the file is uploaded and stored in the temporary folder but cannot be sent as attachment.

Any help will be appreciated

PS I can send emails with attachments of 1 MB with no problems

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1 Answer

  1. Editorial Team

    Okay, answering my own question. Sorry for wasting anyones time.
    First of all, a look on /var/log/mail.log revealed this line

    Oct 4 20:15:39 s16271040 postfix/sendmail[13663]: fatal:
    @.com(33): message file too big

    That made more sense now.

    We go to /etc/postfix/main.cf and add the following line to the end of the file

    message_size_limit = 20480000

    And we have 20MB limit for file attachments, hooray 🙂

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