Mailcow rejects delivery from external distribution list

MusaM

I have 2 domains 1 hosted on mailco and the other on zimbra. The domain on zimbra had a distribution list that needs to deliver mails to the domain on mailcow. If I send an email from name@my-domain.tld (zimbra) to name@my-other-domain.tld (mailcow), the email gets delivered, however when I send an email from name@my-domain.tld (zimbra) to team@my-domain.tld (zimbra Distibution List) which should deliver to email addresses on my-other-domain.tld (mailcow) it gets rejected by rspamd with:

DMARC_POLICY_QUARANTINE (8) [my-domain.tld : No valid SPF, No valid DKIM,quarantine]
R_SPF_FAIL (8) [-all:c]
IP_REPUTATION_SPAM (5.274611) [asn: 63949(0.37), country: XX(0.01), ip: xxx.xxx.xxx.xxx(0.94)]
URL_NO_TLD (2) [www.my-domain]
FORGED_RECIPIENTS •

I have already checked the SPF and DMARC records for my-domain.tld, all looks fine, IP reputation also looking good.
This is a newly deployed mail server for the company and would like to grow usage of the server throughout the African branches therefore I would need to make sure communication is undisrupted.

In addition to the above issue this is the bounce back I get from sending an email to the distribution list.
: host
mail.my-domain.tld[xxx.xxx.xxx.xxx] said: 554 5.7.1 This message does
not meet our delivery requirements (in reply to end of DATA command)

DocFraggle

MusaM Try adding the IP address(es) of your Zimbra server(s) to:

System -> Configuration -> Options -> Forwarding Hosts

This should do the trick I guess

MusaM

I cannot believe how simple that was, I simply added the domain to Forwarding Hosts and Mailcow automagically resolved all the IPs linked to the Zimbra domain aaaand bob’s your uncle. Although the emails started landing in the junk folder but that’s just a matter of tweaking action under configurations.

Thank you so much @DocFraggle, this was really helpful.