Drupal Mimemail Module (HTML Mails, Newsletter, …) unwanted attachment.dat *Update*

In a current project we ran into a curious problem, every HTML Mail has an file attachment named „attachment.dat“.

After some research in the „mimemail.theme.inc“ (function „template_preprocess_mimemail_message()“), we figured out that the problem is located inside the $css content.

In our case the implementation of the google webfont produces this issue (@import url(http://fonts.googleapis.com/css?family=Open+Sans:400italic,600italic,400,600)). Basicly @import has to work inside html mails, so mimemail seems to do something wrong here?

Whatever. We can work around this problem, using the <link …> – implemantation inside the mimemail-message.tpl file instead of the declaration directly inside the css code.