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Asked: 2026-05-26T23:20:57+00:00

I have a problem with creating an RFC mail format with attachment. Please help

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I have a problem with creating an RFC mail format with attachment. Please help me!
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  1. Editorial Team

    Attachments are made in multipart email format. You better use some lib to do it. But if you want to manage it yourself you need to create a document separated by multipart bounaries, that contains files in base64 encoding:

    First, email headers:

    To: admin@example.com
Subject: hi, admin!
Content-Type: multipart/alternative; boundary="some_random_string"

    Than body:

    This is a multi-part message in MIME format.
some_random_string
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: 8bit
<p>Email text and image</p>
<img src="cid:attached_image">

some_random_string
Content-Type: image/png;name="some.png"
Content-Transfer-Encoding: base64
Content-ID: <attached_image> //<- this used in CID
Content-Disposition: inline; filename="some.png"
//here goes base64 encoded image.

    There are some example function in php.net. Look here in comments.

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