I’ve been running my own mail server for this domain and several others for a few years. I could have used our main mail servers, but I like messing around with the server settings and trying out new things.
One thing that I hadn’t been checking too stringently on my inbound email was SPF.
Sure, I had it set up on several of my domains so that anyone else getting mail from me would be “happy”.
Switching it to more stringent settings and checking SPF inbound, however, has proven to be worth the few minutes it took to set it up – over 100 mails blocked in less than 24 hours!
I opted to install postfix-policyd-spf-perl as I’m using Postfix. Configuration was pretty easy – just adding a couple of lines to the main.cf and master.cf (the man page gives you the most up to date configuration settings)
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