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Questions tagged [spamhaus]

11 questions
8
votes
1 answer

zen.spamhaus.org suddenly blocks a lot (but not all) incoming email

This started 6am this morning. Incoming mail being bounced by zen.spamhaus.org. Here's one of the lines from my mail.log file. 024-11-04T14:04:43.619803+01:00 enterprise postfix/smtpd[302212]: NOQUEUE: reject: RCPT from…
user490858
2
votes
1 answer

spamhaus sbl error 3.64.1.98 — blocked using sbl.spamhaus.org; Error: open resolver

For I don't know how long — maybe a decade — I've had the following in my postfix configuration: smtpd_client_restrictions = reject_rbl_client sbl.spamhaus.org, reject_rbl_client blackholes.easynet.nl Recently, I've had users occasionally get…
philolegein
  • 449
1
vote
2 answers

Spamhaus Error: excess volume in Postfix. False positive. Stuck

I am having this weird Postfix issue with Spamhaus excess volume error. First off I checked what the error suggested to check here I followed the instructions and changed my configuration as follows: smtpd_recipient_restrictions…
Dennis
  • 31
1
vote
2 answers

Use Spamhaus on an on-premises Exchange server without an Edge Transport server?

I would like to block spam emails using Spamhaus on our Microsoft Exchange 2019 server. We have the latest Cumulative Update for Exchange installed. I searched online how to do this, but I only came across some extremely old posts. One user…
Danny Beckett
  • 198
1
vote
1 answer

How to whitelist our own outgoing emails from being blocked in amavis/spamassassin using Spamhaus' block lists?

Just after we implemented spam filtering on our Postfix server using spamassassin-dqs through amavisd-new we drastically reduced received spam, but to our surprise our own outgoing e-mails are being blocked as well. Our server runs on a AWS EC2…
Claudio
  • 179
  • 7
1
vote
1 answer

Spamhaus is blocking several customers since a couple of days?

I received a couple of complaints from customers that got their emails rejected. I haven't changed my config, so this must be an issue with spamhaus. I'm running Postfix with these settings for spamhaus: smtpd_sender_restrictions = [...] …
3und80
  • 353
0
votes
1 answer

Debian Mail server + Rspamd not sending or receiving mails anymore. Maybe Spamhaus issue?

my debian mailserver currently does not send and receive any more mails and I am not really finding out whats the problem. I am running debian 12 (bookworm) (previously upgraded from an older debian version) with postfix (3.7.11), dovecot (2.3.19.1)…
mezorian
  • 1
0
votes
1 answer

Postfix custom handling for RBL response (gracefully handling zen.spamhouse.org "excess volume")

So my server out or the blue started rejecting all incoming mail and I pinpointed it to zen.spamhaus.org blocking everything because of an "excess volume" response from spamhaus.org: 2024-11-28T11:57:46.954637-07:00 mail postfix/smtpd[338]: NOQUEUE:…
Tom
  • 51
  • 1
  • 5
0
votes
0 answers

Spamhaus throttling my dns queries. Do I need to run my own dns server?

I am hosted on vultr and I am using their local DNS server in /etc/resolv file. Recently I started noticing the following responses from their DNS based block list zen.spamhaus.org: 451 Error: open resolver I did a fair bit of research and my…
ratatata
  • 23
0
votes
0 answers

Troubles getting SpamAssassin to check mail body for links to blocked sites

I am using SpamHaus BlockList Tester to test if my mailserver is blocking mails originating from known spamming / phishing mail server. The latest run against the Public Mirror Test gave the following results: Test Name MX Probes probe …
Lasse Michael Mølgaard
  • 1,293
-1
votes
1 answer

Spamhaus blacklisted our mdaemon server IP due to wrong HELO

since two weeks ago spamhaus kept on putting our IP address on the CSS blacklist - we've had few thing to fix from the guideline so we delisted ourselves few times after checking all the requirements. Now after 3 times they created a ticket for our…
Backi
  • 1