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Re:Show HN: OpenBSD Email Service – A free-email alternative by ozim on Friday February 16, 2018 @02:44PM (#16395377)
Yes and also they block receiving emails from GMail domain for security purposes. So if you want to email someone internal in big co, you have to do it from your own domain. I suppose it is not only for GMail. Probably Yahoo, Microsoft also but I only had one guy trying to use GMail sending mail to corporate users.
Re:Show HN: OpenBSD Email Service – A free-email alternative by mseebach on Friday February 16, 2018 @03:23PM (#16395756)
Before you said "spamhole", now it's security. In both cases it makes literally no sense to block Gmail and allow random personal domains. I suppose the setup could be based on whitelisting domains, and because Gmail is so big, they won't whitelist it, and it also won't receive emails from anything random, but from specific personal domains. But such a setup specifically isn't for communicating with the world at large, and not any kind of widespread practice.

Also, you should be using your own domain with Gmail (or any other provider) so you aren't tied to anyone, anyway.