Question for those with custom domains: How do you make sure that the emails you send don't end up in people's spam folder?

A little while ago I finally bought myself a domain. I was very happy to find that myfirstname.pm was available, so that I could use "mail@myfirstname.pm" as my email address.

It looks great [at this page where you can test the spamyness of your email address](https://www.mail-tester.com/) however my emails still usually end up in people's spam folder anyway.

So I ask those with custom domains: How do you make sure your emails don't end up in people's spam folder? Would …

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