''[Locked as a duplicate of https://support.mozilla.org/en-US/questions/1281461. Please follow up there, thanks.]'' I am using the latest version of thunderbird and out of the blue thunderbird started sending random emails with large attachments. The messages are attaching pictures from old emails. I am getting somewhere in the range of 50 emails trying to go out. I am not sure how to find out who the recipient is supposed to be. Thunderbird is giving me error messages due to the size of the messages trying to send. The pictures that are trying to be sent are going into the users/name/appdata/local/temp folder. I delete them, restart thunderbird, and after about a minute the same pictures repopulate in that folder. I suspected a worm or virus, however, I have ran antivirus, malware bytes, etc. All say there is no virus. I even had a level 2 tech at norton check my system, twice. Does anyone have any ideas what is happening.