On 12/31/08 11:34, Mark Sapiro wrote:
You can filter based on file name extension, but that filter only affects MIME parts that have a filename or name parameter in the Content-Disposition: header or a name parameter in the Content-Type: header. Many MIME parts will not have a name/filename so they can't be filtered based on extension.
I don't know of any email client that will send an attached file with out the "name" parameter to the Content-Type: header. So, with this in mind, it should be possible to deduce that any MIME section that is not text/plain or text/html (or their multipart/alternative encapsulation) that does not have a "name" parameter is very likely embedded content and as such probably ok to remove.
The concept of attachment is not well defined in MIME. There is a Content-Disposition: header that can specify inline or attachment, but Mailman doesn't look at it.
I think the word "attachment" needs to be better defined here. Are you referring to what an email author ""attaches to a message, or any thing else that is embed with in the message. I think the actual attachment (by the message author) will always have a Content-Disposition of attachment. It should only be embedded content that differs. Though, I know that some MUAs will embed pictures rather than attaching them.
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