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Cannot register host due to not receiving incoming email.


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My mail server is pretty rigorous and will fail to accept email under certain conditions.

 

Nov  4 15:46:35 www postfix/smtpd[2692876]: NOQUEUE: reject: RCPT from vmx.spamcop.net[184.94.240.112]: 450 4.7.1 <prod-sc-www02.spamcop.net>: Helo command rejected: Host not found; from=<service@admin.spamcop.net> to=<me@mydomain.com> proto=SMTP helo=<prod-sc-www02.spamcop.net>
 

prod-sc-www02.spamcop.net does not resolve to an IP, therefore your mail is dropped. Please fix this. Thank you.

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4 hours ago, nelgin said:

My mail server is pretty rigorous and will fail to accept email under certain conditions.

 

Nov  4 15:46:35 www postfix/smtpd[2692876]: NOQUEUE: reject: RCPT from vmx.spamcop.net[184.94.240.112]: 450 4.7.1 <prod-sc-www02.spamcop.net>: Helo command rejected: Host not found; from=<service@admin.spamcop.net> to=<me@mydomain.com> proto=SMTP helo=<prod-sc-www02.spamcop.net>
 

prod-sc-www02.spamcop.net does not resolve to an IP, therefore your mail is dropped. Please fix this. Thank you.

Your analysis does not seem correct?
https://talosintelligence.com/reputation_center/lookup?search=184.94.240.112

IP ADDRESS           HOSTNAME           FWD/REV DNS MATCH
184.94.240.112     vmx.spamcop.net                Yes

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The helo received by my server seems to show up as vmx2.spamcop.net, vmx1.spamcop.net, or vmx.spamcop.net. Last time I saw something from prod-sc-www2.spamcop.net, was around 2009. From what I can see in the DNS, it looks like it might have an IP.

;; ANSWER SECTION:
prod-sc-www2.spamcop.net. 300 IN MX 10 adminmx.spamcop.net.
prod-sc-www2.spamcop.net. 300 IN A 204.15.81.110
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