User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; WOW64; en-US; rv:2.0b1) Gecko/20100630 Firefox/4.0b1 ( .NET CLR 3.5.30729; .NET4.0C) Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.4) Gecko/20100608 Thunderbird/3.1 I have a filter which deletes messages in a folder. When I run it once it puts a red X on the messages. If I run it again, it removes the red X (thereby undeleting the messages). It's what you might expect, but still odd.. I would think you wouldn't want a delete filter to undelete messages. Reproducible: Always

Show "Order Received" column. It's UID of mail when IMAP. Get IMAP log and check "uid xxx store" for \Deleted flag, please. > https://wiki.mozilla.org/MailNews:Logging > SET NSPR_LOG_MODULES=timestamp,imap:5 \Deleted flag is stored twice?

As Wayne says in bug 228949 comment #14, it looks similar to bug 228949. Setting dependency for ease of tracking.

Dan, does this still reproduce for you?

Peter. You use mark as deleted - can you test this? (Dan no longer uses Thunderbird)