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Editorial Team
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Asked: 2026-05-13T20:24:55+00:00

I want to force the reader’s email client to display my php-generated plain text

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I want to force the reader’s email client to display my php-generated plain text emails with a fixed width charset.
Thunderbird displays the email with a fixed width charset. However, Gmail and Outlook (and probably more clients) do not.

Is this a config setting with my mail server or something I’m doing wrong?
Any help would be greatly appreciated.

These are the headers I’m currently using:

    $header = "MIME-Version: 1.0\r\n"; 
    $header .= "Content-type: text/plain; charset=ISO-8859-1; format=flowed\r\n"; 
    $header .= "Content-Transfer-Encoding: 7bit\r\n"; 
    $header .= "X-Mailer: PHP" . phpversion() ."\r\n"; 
    $header .= "From: ihateoutlook@email.com\r\n";
    $header .= "Reply-To: ihateoutlook@email.com\r\n";
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1 Answer

  1. Editorial Team

    You cannot force the plain text message to use any specific font. The best you can do is send HTML email using the monospace font family.

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