Re: [TUHS] Who is running their own mail server and what do you run?

We provide email service for a few hundred (mostly legacy) customers. The essential elements of the system are: Linux (HA pair) Postfix SpamAssassin ClamAV RBLs (Spamhaus) MySQL database Maia Mailguard I spend maybe five minutes a week maintaining the system. The most important part is Maia Mailguard. Incoming email is scored by SpamAssassin (higher = more likely to be spam). Above some threshold, which can be tuned up or down by the user, the mail is tossed into their spam quarantine. The user is able to browse this quarantine. False positives can be freed-up and delivered as usual and the sender is whitelisted. True positives are confirmed and contribute to training the filter. After a little while the system gets pretty good at automatically distinguishing between spam and ham. The important point of this system is that it puts the user in control. Too much spam? Turn the spam threshold setting down a little lower. Too many false positives? Turn that knob a bit higher. Expecting an important email? Whitelist the sender or check your spam quarantine. As a mail admin, my goal is to give the users the tools to manage their own email effectively according to their requirements. I don't want my phone ringing every time some user wants to complain that he gets too much spam. The system has been a success. Complaints from the users have dropped to nearly zero. I spend very little time thinking about or dealing with the mail system. Stats follow. As of: 2017-09-20 11:38:53 PDT Efficiency 99.35% False Positive 0.50% False Negative 0.15% Sensitivity 99.84% PPV 99.45% Specificity 94.00% NPV 98.16% --corey