Email - content type 'multipart' - what does it mean?

hi guys,

We have had some issues with an email template recently. We created an email template which has been designed as responsive, using a service called Inkbrush and sent the email as a test to ourselves. The template turned out absolutely fine when received. When we looked at the header of the email, the encoding section, it had the below:

Content-Type: multipart/alternative;
boundary="--==_mimepart_564b67cddcf18_33ff6907d1e84329de"; charset=UTF-8
Content-Transfer-Encoding: 7bit

However, when we copied the same template onto our servers on the Amazon side which used a the Postfix service to send the email via our php mailer, the template arrived with some broken links with pictures with red crosses on them. The encoding on it was:

MIME-Version: 1.0
Content-Type: text/html; charset=UTF-8

What I wanted to know is whether the multipart being inserted into the actual first email being sent could be affecting everything? Also, how important is 'multipart' and what does it mean?

Thanks for helping
Yashy
LVL 1
YashyAsked:
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Julian HansenCommented:
The multipart means that the message contains multiple sections separated by the boundary
boundary="--==_mimepart_564b67cddcf18_33ff6907d1e84329de"; charset=UTF-8

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The boundary can be anything but must be unique to the message i.e. you don't want your bondary text to be something that could be in the message body.
The boundary determines the start and end of each section.

So, for instance, if your email has a text part an html part an embedded image and an attachment each of these will be loaded in a different section with appropriate encoding separated by lines of text that match the boundary string.

So yes in all likelihood the multipart header is important.

You will need to setup your email sending code to insert the appropriate message boundaries and encoded sections.

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Dave BaldwinFixer of ProblemsCommented:
It is very important.  It is used as a separator for the different parts of an email like 'plain text', 'HTML', and embedded images.  This page has a simple explanation: https://en.wikipedia.org/wiki/MIME
YashyAuthor Commented:
Do you know what the name of the file is to add the 'multipart' into on a linux instance? I believe this is a php file.

Thanks for helping me, much appreciate it.
Julian HansenCommented:
I don't understand the question?

The multipart is included in the message.
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