Emails sometimes get scrambled

Posted by Alex on Stack Overflow See other posts from Stack Overflow or by Alex
Published on 2010-03-10T05:42:50Z Indexed on 2010/03/14 3:15 UTC
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Folks,

I have a PHP-based based site (using the QCubed framework); as a part of the site, I have a daemon that's sending out several thousand emails a day (no i'm not a spammer, everything is opt-in :)). Emails are sent through a custom framework component; that component serves as an SMTP client. I'm using a paid SMTP gateway from DNSExit.com to get the emails actually delivered.

Those emails are simple HTML-based emails; they really have just simple links inside.

My issue is that these links sometimes (not consistently!) get scrambled during transition. Tags somehow get mixed up, and some links are non-functional in the email. The issue happens on a small percentage of all sent emails; it is not consistent (i.e. the same exact source message HTML may or may not cause the scrambling in transition).

Have any of you seen this? Any thoughts on how to troubleshoot?

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