Why did a file attach itself to sent mail without my clicking the attach button?
I sent an email that I did not attach anything to. When I checked my sent folder I saw there was an attachment on it. Clicking on the attachment opens the Adobe Reader and says the file is damaged.
This happened with a gmail address. When I checked it on gmail, there was no attachment.
Do I have a security problem?
Wšykne wótegrona (1)
If you see the message you sent on the server your account must be IMAP. Then it's not possible that you do see something different in Thunderbird than on the server. I guess you left something out in your problem description.
What kind of file is the actual attachment?