Reply doesn't show in sent folder
It has been some days that any email I reply via thunderbird is not saved/copied in the "sent" folder, although I checked both "sent" folder and “Place replies in the folder of the message being replied to”。
It was all OK before: my replies were in both "sent" folder and in the tree of inbox. However, now my reply only shows in inbox. The only way I find now to have my reply in the "sent" folder, is to uncheck the "Place replies in the folder of the message being replied to" option, but I want my reply in both folders as how it was before.
This is extremely annoying, as I can't know if the email has been correctly sent or not. How can this be fixed?