We updated our Smartermail software from 13.x to 15.x on a server with approx. 12000 users. After making plenty users happy with some new features we started receiving complaints about spam, which we haven't had in 2 years.
It appeared during the update process the greylisting became disabled. After rerunning the standard Wizard, settings medium, activating Greylisting, it became slightly better but still we received far more complaints then we were used to. After tweaking too many legitimate e-mails got marked as spam and ended up in junk or even got deleted.
So, now we disabled all Smartermail spamfiltering options and activated the Message Sniffer trial. Last couple of days we received complaints anymore.
I have two questions I hope someone can answer:
- do any more changes to spam-related settings occur during the update process to a newer version of the Smartermail software?
- is the message sniffer option considered to be a good solution if used as the only active filter in a smartermail installation?