Alternative to Postfix for Using Rspamd with cPanel’s Exim
Hello,
We are running AlmaLinux 9 with cPanel & WHM v128.0.17 (STANDARD). Our goal is to implement Rspamd as a spam filter, ideally positioned in front of Exim.
The original plan was:
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Install Postfix
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Use it to receive all inbound mail
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Pass messages to Rspamd for spam filtering
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Then forward accepted mail to Exim for delivery, preserving cPanel compatibility
However, we ran into an issue: Postfix installation is blocked. Even using dnf install postfix --allowerasing --nobest, the system reports that cpanel-exim is already installed and takes no further action. We assume cPanel is preventing the coexistence of another MTA.
To complicate matters further, cPanel’s Exim build does not include milter support, so we cannot connect Rspamd to it via milter.
We are now looking for recommendations or alternative approaches to integrate Rspamd into our mail flow without replacing Exim. Specifically:
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Is it possible to call Rspamd’s /checkv2 HTTP endpoint from within Exim ACLs?
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Can this method be integrated safely within cPanel’s update cycle, using exim.conf.local or exim.conf.localopts?
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Has anyone successfully used Rspamd as a filtering layer with cPanel’s Exim, without needing Postfix or breaking Exim updates?
We are looking for a stable and update-resilient method. Any advice, example configurations, or guidance would be appreciated.
Thank you,
Bill
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Hello Bill. We are trying to find an alternative to ConfigServer MailScanner for our WHM servers.
We have Imunify360 installed on them and tried Imunifyemail, but, we think that it is not really good compared with ConfigServer MailScanner.
We are wondering to install Rspamd following the step by step procedure from Rspamd webpage. Did you check it?.
Kind regards.
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Found this (untested), hope it helps: https://gist.github.com/mdpuma/f1c347091717240276fcb0bab737f7ec
Bill, have you tried rspamd? is it good?
Thanks,
Ignacio
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