Hit ENTER after each Tag to add it to your post; Numbers in parentheses represent the Tag's usage.
Using SM and Thunderbird IMAP (latest versions):
- In Thunderbird, delete a message. The message is moved to Deleted Items and all is good.
- Go into webmail and the message still shows in the Inbox with a strikethrough (annoying, but OK, you can live with it).
- Do something in webmail, like move a message to a folder. SM does a cleanup and now you have duplicate messages in Deleted Items.
Thunderbird is configured to move message immediately and seems to work fine with other mail servers.