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Hardening unused mail domains.
https://www.mailhardener.com/kb/hardening-unused-domains
saved 2022-11-18 https://dotat.at/:/YSI0K.html
@fanf My eyebrows did things as I read this, because I don't think parts of this are going to work. For example, if you don't expect incoming email but want to send outgoing email, a null MX is definitely not what you want.
@pro @cks @fanf Yeah, I do the opposite, I have a domain where I've given out tons of sub-email addresses from it to all kinds of different websites and companies, but because bots started using it to send spam, I set it to -all on spf, and I use a completely different email domain to send messages. That domain, I don't really give out addresses for to anyone.
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