Email blocked even though I added it to the whitelist

[Daniel15]

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Summary

I added an address like root@example.com (not the real domain) to the whitelist for my domain. However, emails from this host are still being rejected due to its IP range being on a blacklist. In my case, I want to ignore the blacklist and always accept emails from this address/server.

Logs

Postfix logs from Mailcow UI:

NOQUEUE:  reject: RCPT from [104.244.77.121]:52684: 550 5.7.1 Service  unavailable; client [104.244.77.121] blocked using  b.barracudacentral.org; from=<root@example.com>,  to=<xxxxxx@other.example.com>, proto=ESMTP, helo=<example.com>

Reproduction

Whitelisted in Mail Server -> Domains -> Edit -> Spam filter

System information

Question	Answer
My operating system	Debian Linux
Is Apparmor, SELinux or similar active?	Yes
Virtualization technlogy (KVM, VMware, Xen, etc	KVM
Server/VM specifications (Memory, CPU Cores)	3 cores, 16 GB RAM
Docker Version (docker version)	20.10.3
Docker-Compose Version (docker-compose version)	1.28.4
Reverse proxy (custom solution)	Nginx

[andryyy]

Hi, you need to add 104.244.77.121 to the Postscreen whitelist. I will try to move the RBL stuff completely to Rspamd in the future. :/

Check https://mailcow.github.io/mailcow-dockerized-docs/u_e-postfix-postscreen_whitelist/

[Daniel15]

I just confirmed that worked. Thank you!

[andyruonline]

@andryyy I just made a feature request for handling RBL stuff in Rspamd - #5329

Any updates on this?

Thanks.

[kot-camojiet]

Hello,

I'm running into a problem with mailcow's NOQUEUE: reject blacklist. Needed IP address is listed on zen.spamhaus.org (and only on it), and the email is being rejected at the postscreen stage.

postfix/dnsblog: addr 185.69.80.20 listed by domain zen.spamhaus.org
postfix/postscreen: DNSBL rank 10 for [185.69.80.20]

Yes, i can add the IP to data/conf/postfix/custom_postscreen_whitelist.cidr and the problem will be resolved, but to do that, you need to know that the email was sent and find the IP:
docker compose logs postfix-mailcow --since 2026-02-24T00:00:00 --until 2026-02-24T23:59:59 | grep "NOQUEUE: reject" | grep mailbox@domain.org

That is, if the sender's IP is on one spam list, the email is silently rejected, with a small chance of being detected without the recipient's help.
Moving RBL to rspamd would solve this problem; the rejection would be visible in the GUI, and the email could be quarantined.

I use 2026-01 ver.
Thanks