I'm running my own email server for more than 20 years now. And spamassassin still works fine, filtering locally. But even before spamassassin gets stuff to ana

I'm running my own email server for more than 20 years now. And spamassassin still works fine, filtering locally. But even before spamassassin gets stuff to analyse, my postfix server checks if a sender's ip address has a reverse dns mapping (most hacked office clients don't have one) and last but not least asks the postgrey policy server if it should accept an incoming message immediately or tell the sender to retry after some time. That is, I'm using greylisting, and yes, this still blocks quite a number of incoming messages, as spammers do not retry to send their spam, if it doesn't work at the first attempt. So with excellent software like Wietse Venemas Postfix and a rather restrictive setup, an email server is a low maintenance server to use IMHO. Edit: running your own email server gives you enough email address for you and your family to make it much easier to detect phishing emails: one address per shop and you'll notice if an email to the address of a shop tries to pose as your bank or some other sender. And it's easy to block certain senders after their job is done.