Postfix/rspamd

[iRobot]

Hello,

I have configured Postfix on OPNsense 24.7.8-amd64 as a smarthost for my internal network devices. All devices send their mails to Postfix and via smarthost outside.

My config:
Postfix - General:
- Listen ip: all
- ListenPort:  25
- Trusted Networks: 192……../24
- TLS Server compatibility: intermediate
- TLS client compatibility: intermediate
- TLS wrapper mode: yes
- Smart Host: smtp.providername.de:465
- Server certificate: mycertificate
- RootCA: myrootCA
- Smtp client security: encrypt
- Smarthost: smtp.servername.de:465
- EnableSMTP Authentication: yes
- Authentication Username: user@domain.de
- Authentication Password: UserPW

Postfix - AntiSpam:
Enable Rspamd integration: yes
Milter default action: accept

One day I noticed that my E-mails were no longer passing through the smarthost. The postfix log shows:

Warning   postfix/smtpd   warning: milter unix:/var/run/rspamd/milter.sock: read error in initial handshake
Warning   postfix/smtpd   warning: milter unix:/var/run/rspamd/milter.sock: can't read SMFIC_OPTNEG reply packet header: Operation timed out
Warning   postfix/cleanup   warning: milter unix:/var/run/rspamd/milter.sock: can't read SMFIC_BODYEOB reply packet header: Operation timed out

I tried to connect rspamd: http://OPNSenseIP:11334  but it failed with a timeout-error.

I then unchecked „Enable Rspamd Integration“ and the smarthost worked fine again.

It looks weird to me. Any help would be appreciated.