Dnsforge.de is resolving some domains in a really bad way

This is going to be a unique issue and not everybody will be affected but it was kind of annoying until I understood what is happening.

I put dnsforge.de as one of the upstream DNS servers.

As a result, nobody could check or sent emails hosted on hostgator.

Reason for this was that DNSforge.de is resolving the mailserver as and that confused the heck out of me. see "dig" below

If you check https://dnsforge.de/ they filter domains using Public blocklists. Hostgator mailserver is not on any of these lists.
I can't find why this particular Hostgator mailserver is on their blocklist, I guess they must have a private blocklist that I can't see.

So I stopped using DNSforge and everything is fine now.

dig @  mach4.websitewelcome.com

; <<>DiG 9.10.3-P4-Raspbian <<>> @ mach4.websitewelcome.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13292
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

; EDNS: version: 0, flags:; udp: 512
;mach4.websitewelcome.com.      IN      A

mach4.websitewelcome.com. 3600  IN      A

;; Query time: 119 msec
;; WHEN: Wed Jan 13 22:52:59 PST 2021
;; MSG SIZE  rcvd: 69

Seems like I'm the only knucklehead who tried dnsforge as upstream server

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