Unfortunately this article neglects one of Gmail's strongest features: superb turnkey spam filtering.
Anyone with an email address older than 5 years is going to be buried in spam thus will need spam filtering with a super low false positive rate.
Anyone with an email address older than 5 years is going to be buried in spam thus will need spam filtering with a super low false positive rate.
I'm not sure how one could parallel this kind of behavior in a self-hosted mail solution.
I've had my current domain for 10 years, don't run any spam filtering ( just fail2ban ) and I've had fewer pieces of spam than I have fingers.
So whatever you're doing... Stop doing it.
Setting it up can mean that you check these things on the receiving end. Big difference between self-hosting and accepting all e-mails and self-hosting and checking the sender's SPF and DKIM.
That said, it will reduce bounce-back from spam that forges your domain.