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Why would a receiving mail server check the DNS A record of the from domain against a blacklist?

cn flag

Most (all?) of the DigitalOcean network is currently listed on UCEPROTECT Level 3 (again).

I know that UCEPROTECT Level 3 is widely regarded as shady and I personally recommend to our clients that this should not be used. Less, anybody should stump up money for a problem created entirely by them.

Regardless, I have a droplet which relays email through MailGun and does not send any email from the droplet itself. Some of those emails are bouncing, citing a floating IP address associated with the domain name in the from address as being listed on UCEPROTECT Level 3.

Since that IP address has absolutely no relevance to the origination of these emails and isn't even the IP address of the droplet, should I assume that the receiving mail server is mis-configured? I can understand why a spam filter would check the sending IP address, but not the DNS A record of the from domain.

mangohost

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