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Asked: 2026-05-11T07:19:51+00:00

I have a website in which I send a confirmation mail as part of

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I have a website in which I send a confirmation mail as part of the registration process.

Some time ago, I had some troubles with the mails I sent since I used no headers (PHP mail function).

Once I put some headers, I’ve gotten more responses from users, but I suspect that not every message reaches its destination.

How can I be sure that the messages reach their destination?

Which are the headers that can be considered a ‘must’?

This is the code of my SendMail function

mail($to,     $subject,         $message,             "MIME-Version: 1.0\n".             "Content-type: text/plain; charset=ISO-8859-1; format=flowder\n".             "Content-Transfer-Encoding: 8bit\n".             "Message-Id: <" . md5(uniqid(microtime())) . "@mysite.com>\n".             "Return-Path: <admin@mysite.com>\n".             "X-Mailer: PHP v".phpversion()."\n".             "From: admin@ mysite.com");
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1 Answer

  1. The headers need a white space at the bottom to separate the header from main body. Tools like Spam Assassin will give you a big mark down for that.

    Also you should use \r\n as a line terminator instead of just \n

    From PHP.net

    Multiple extra headers should be separated with a CRLF (\r\n).

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