GPGMail is a plugin for Mail.app that adds a GUI for gnupg. If that wasn't English to you, this post is not for you.

It seems that there's a bug in GPGMail that causes messages to randomly be marked unread even after you've read them. I've experienced this bug first hand, though it took until now to learn what was causing it. While it doesn't affect me much at home, it causes havoc for me at the office. That's why I'm thrilled to try out the fix hinted to in this archived email. Note: When clicking that link, read the htaccess box.

Essentially, the email suggests that the issue only occurs when the checkboxes marked, "Only if message is unread" are checked. You'll find those under the Viewing section of the PGP section of your preferences.

I've made the changes here at home, but I won't really know until I try it at work tomorrow.

Update (2006.03.27 12:38pm): By now I'd have had several occurrences of the reported issue and have not yet had a single one. I have thus far been shocked to see not a single problem. It looks like this fix is for real.

[via HawkWings]