Don’t DIY
Before we get into DNS-based defenses, here’s a simple piece of advice about email hosting—don’t do it yourself. Just host your company’s email with [G Suite from Google.](https://gsuite.google.com/) (Ok, you could also pick Outlook 365 if you like Microsoft. There are other email hosting options, but I don’t believe any of them are able to put as many resources into security as these two companies do.) It’s a lot of work just to keep a mail server up and running with the reliability that email requires. It’s even more work to keep it patched and configured securely. Maintaining a mail server is a full-time job. And if you want support on holidays, weekends, evenings, and sick days, it’s a full-time job for more than one person. If ...
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