Still unable to duplicate the exact problem as reported. However, a couple weeks ago I did see a similar problem with a promotional email received from mozilla with the subject "What's an IP Address?". The email arrived OK but the subject in the summary line was totally blank. At the time it arrived I was not able to determine why it occurred and still haven't while looking at this bug. I suspect they are related.
Bug 1712971 Comment 11 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
Still unable to duplicate the exact problem as reported. However, a couple weeks ago I did see a similar problem with a promotional email received from mozilla with the subject "What's an IP Address?". The email arrived OK but the subject in the summary line was totally blank. At the time it arrived I was not able to determine why it occurred and still haven't while looking at this bug. I suspect they are related. Edit addendum: Reporter Emilio, do you ever see this on old emails that have been sitting around in folders that at one time displayed the correct subject, or do you only see this on newly arrived emails?