Receiving an email that refuses to follow Gnus' client-side filter rules?
(setq nnimap-split-fancy '(| ("subject" "media alert" "INBOX.pressreleases") (many other rules here) ;; Default mailbox "INBOX"))
If running B q on the message shows you the filter rules do not apply, then perhaps the Subject header is encoded.
Check the raw message (c-u g), and if it looks something like:
then this will help:
; Decode headers before splitting on them: (setq nnmail-mail-splitting-decodes t)
Thanks to Adam Sjøgren on usenet’s gnu.emacs.gnus