I just heard about policyd-weight so I did an apt-cache search policyd which returns three options:
Which one is the best, and do you have any tips on setting them up?
Our current setup is whitelister plus postgrey to greylist RBLd hosts, then fail2ban them for 10 minutes if they have 10 failures, followed by content filtering (Kaspersky Anti-Spam). The content filtering is pretty good, but there's still a lot of spam that gets through the RBL greylisting.
What do people use to monitor that their email server is accepting external email? Most monitoring solutions send notices by email which is useless when incoming email breaks, so some other method of notification is required. Ideally this is a piece of software that we can just run locally, but external services are also acceptable.
Background: Our ADSL modem has a stupid firewall that blocks incoming connections, which can be removed manually via telnet but comes back whenever the PPPoE connection drops. We're going to buy a new one soon, but having monitoring for email seems like a good idea generally.