The latest edition of Nemeth, et al., Unix/Linux System Administration says basically the same thing. Spam filtering, for example, is a whole horrible thing tha

The latest edition of Nemeth, et al., Unix/Linux System Administration says basically the same thing. Spam filtering, for example, is a whole horrible thing that will be essentially a full-time job for anyone running a mail host. Hell, about two years ago I gave up on self-hosting. Unwanted email got to be the vast majority of what I was receiving and spam filter software ate more memory than my itty-bitty host had, meaning I would have had to get a bigger, specific mail host. (As it was, the IMAP server was the biggest process running on my host.)