I have a Zimbra 8.8.6 server running with about 40 domains and about 1000 users. I'm really satisfied with the server performance but some of my clients are having trouble with SPAMs bypassing the SPAM filter. Can any of you sugest me a efficient and affordable spam filter service compatible with Zimbra. I already tried SpamExperts without much success.
Any advise about how to deal with this unwanted messages in zimbra are welcome too.
