I only seem to have this problem on this list and the mrtg lists... however a number of messages come with attachments. Looking at them, they appear to generally be PGP keys. Not a major issue, but now I have dozens of them (well, more).
Not to pick on people, but just in the last few days, I see it from Theo Van Dinter, Michael Parker, Thomas Bolioli, and that seems to be it for the past week or so.
I'm using Eudora Windows 6.2.1.2. Any way to turn this off?
Note: I use Eudora.
Unfortunately, this is a design "feature" of Eudora.. It always extracts attachments, and has to, as it does not support leaving them in the message mailbox. This has lead to numerous security exploits against eudora in the past. Since the attachment extraction happens automatically when the message is downloaded, malicious encodings get decoded automatically...
Your best bet is in Eudora options, under attachments, enable the "delete attachments when emptying trash". This will make eudora clean up a messages attachments when you empty it out of your trash.. Not perfect, and you have to make sure to save attachments you want keep, but it's helpful and automated.
You might also consider enabling 'put text attachments in body of message'... but that's a bit problematic if you really want a text attachment to be saved separately..