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Receive only email server
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this post was submitted on 30 Jan 2024
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I would also set up SPF to disallow all IPs to send mail for that domain in case some system supports SPF but not DMARC.
Thanks to both of you.
I had the hope that DMARC, SPF and DKIM was stuff I could just ignore if not sending email. It seems I was wrong about that.
Those three are really not all that complicated, basically (apart from DKIM which you can ignore when not sending) they are just a couple of TXT DNS records you need to set once for your domain. Even if you were using DKIM it is just a keypair you generate and then put the public key into a DNS TXT record and configure your mail server to use the private key.