Pay attention to your screen shot. You have "Match ALL" in lieu of "Match ANY"... I had a similar issue until I realized my I D 10 T oversight :)

@chuy1 if I check "Match ANY", it will not use all conditions in filter I think. For example, it will delete all messages which are not starred.

@René I am confused. The original message states "need to automatic delete all messages older than 30 days". Nothing about it being starred/not starred.

As a work around, in lieu of the action being "Delete Message", change to "Move Message to" and then select the "Trash on @@@@"

BTW, I've had issues with filters not working lately ... as a matter of fact, they are going to my Junk folder in lieu of being filtered

@chu1 this is why I attached screenshot. Tried change "Delete Message" to "Move messages to trash in IMAP", same result. No messages was deleted / moved . Waited for about 40 minutes.

btw it worked fine with my settings. This week I found it stopped to work.

@René I'm having "filter" issues too, mines the junk filter in addition to filters not being applied https://support.mozilla.org/en-US/que.../1408927#question-reply. I'll keep an eye out on this thread, hope someone else can help.