Rated 1 out of 5 stars
I am using Thunderbird 38.7. I kept finding that when forwarding mails with attachments, the attachments or at least some of them were not affixed to the forwarded mail. After disabling add-ons one at a time I found that "Close on reply" was the culprit. Since disabling the add-on the problem has disappeared.
Would appreciate it if this could be solved so that I can continue to use the add-on.