We had the same issue with our hosting server, but we are running RSpamD. systemctl status rspamd returned an error about rspamd being masked. Here is a report from my technician...
I moved your issue to a new thread as the thread you posted to was about manually configuring Postfix blacklists and not about Rspamd. The ISPConfig updater cannot mask Rspamd, so this must have been reverted to a manual configuration you made on your system.
We had not made any manual config for RspamD, but the above steps did resolve it. Hope it helps others. The failure must have been a fluke.
The primary issue I see with the solution is that the error message and the proposed solution do not align. Rspamd does not use port 10024; it's an Amavis port. And you can not have fixed Amavis by unmasking Rspamd. Essentially, the error indicates that a message in the queue was forwarded to Amavis, which was unreachable, and you resolved the issue by unmasking Rspamd. It's great that you were able to fix it like this, but most likely this will not be solution for others, as there must have been other things going on on that system which are either not covered in the error description or not covered in the solution. What might be is this: The system was changed from Amavis to Rspamd? Maybe these messages had been sitting in the queue since then, and nobody noticed them. Now the requeing of the message started a new re-delivery, which happened through Rspamd as the Rspamd config is now in place in postfix instead of the amavis config.
The oldest date in the queue was Saturday. No messages delivered since then. I am not sure what happened or why... but I am watching the server and mails are all delivering now. If I netstat -tunlp | grep 10024 I get rspamd as listening to that port. But is Amavis better, should I switch over?
Then your system must be heavily modified to use different ports, as port 10024 is only used by Amavis on ISPConfig systems. ISPConfig Server with Rspamd: Code: root@server1:~# netstat -ntap | grep rspamd tcp 0 0 127.0.0.1:11334 0.0.0.0:* LISTEN 195396/rspamd: main tcp 0 0 127.0.0.1:11332 0.0.0.0:* LISTEN 195396/rspamd: main tcp 0 0 127.0.0.1:11333 0.0.0.0:* LISTEN 195396/rspamd: main tcp6 0 0 ::1:11333 :::* LISTEN 195396/rspamd: main tcp6 0 0 ::1:11332 :::* LISTEN 195396/rspamd: main tcp6 0 0 ::1:11334 :::* LISTEN 195396/rspamd: main No service running on port 10024 on a ISPConfig Rspamd server: Code: root@server1:~# netstat -ntap | grep 10024 root@server1:~# If you search for port 10024 in ISPConfig config file templates, you can find it here: https://git.ispconfig.org/ispconfig...tpl/amavisd_user_config.master?ref_type=heads In the amavisd config file template. So not sure what you did with your system config, but its definitely non standard and uses non-standard ports for services.
Okay. Adam has clearly done something along the way and failed to document it. I will investigate as soon as I can so that I can get it working correctly. Thanks for the info
If it works fine now and your sysadmin is happy with it, you should consider keeping it. Please note that standard solutions for problems discussed in this forum may no longer apply to your system if it uses a highly customized setup.