Hello Hestia community, I’m running HestiaCP with Exim4, ClamAV and SpamAssassin on my mail server. Over the past few days, I noticed that incoming messages from both Outlook (Office 365) and GMX were being rejected with a “550 Rejected because is in a black list at zen.spamhaus.org ” error. Howeve…

[image] eXe: Could someone explain why using Cloudflare’s DNS causes my server to appear as an “open resolver” and end up on Spamhaus, and how I can fix it? [image] Exim rejecting emails Because Spamhaus rejects requests for some public dns resolvers. …

Hi everyone, I ran into this issue again after removing my temporary whitelist entries. Now, GMX mail submissions are blocked with: SMTP error from remote server for RCPT TO command, host: mail.domain.de (152.xx.xx.xx) reason: 550 Rejected because **212.227.15.19** is in a black list at zen.spamha…

Below is a concise report of the workaround I’m currently using to bypass the “550 … in a black list at zen.spamhaus.org ” errors for GMX and Outlook IPs, followed by some questions about whether this is the best approach. Summary I added a directive in Exim’s global options to force all DNS and RBL…

What resolver are you using? Check if those resolvers are being blocked by spamhaus. Run this to check: curl -sSL https://7j.gg/chksph2 | bash -s -- If those are being blocked, change them to: 76.76.2.0 & 76.76.10.0 Then check again via the command after restarting exim.

21:05 ~ $ curl -sSL https://7j.gg/chksph2 | bash -s -- Test 01: Listed by XBL, see https://check.spamhaus.org/query/ip/127.0.0.4 Test 02: Listed by XBL, see https://check.spamhaus.org/query/ip/127.0.0.4 Test 03: Listed by XBL, see https://check.spamhaus.org/query/ip/127.0.0.4 Test 04: Listed by XBL,…

[image] eXe: sudo nano /etc/exim4/conf.d/main/00_local_options # Force all DNS and RBL lookups to local BIND9 dns_servers = 127.0.0.1 Exim ignores that config file, so it doesn’t work (at least not if you haven’t changed the configuration). Hestia configures Exim to use a monolithic config fi…

I edited /etc/systemd/resolved.conf to use Cloudflare’s public DNS: [Resolve] DNS=1.1.1.1 1.0.0.1 FallbackDNS=2606:4700:4700::1111 2606:4700:4700::1001 DNSOverTLS=yes Then I ran: systemctl restart systemd-resolved Now systemd-resolved is correctly using those DNS servers, but whenever I send mai…

Intermittent Spamhaus RBL Blocks for Outlook & GMX on HestiaCP/Exim

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sahsanu May 23, 2025, 8:57am 8