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Hello!
We have the problem with one of our servers at Host Europe, that the ipv6 address of the server ends up on a the SPAMHAUS CSS from time to time. More precisely not our address but the complete class-c net including our ipv6 address.
So I'm searching for the possibility the disable sending ipv6 via qmail.
The hint to type our ipv4 address in /var/qmail/control/outgoingip and to change it via iptables (iptables -t nat -A POSTROUTING -p tcp --dport 25 -j SNAT --to-source xxx.xxx.xxx.xxx) didn't work for our system (Plesk Obsidian 18.0.30 MU3 - Ubuntu 18.04.5 LTS) in this case.
I also know, that I can disable ipv6 in the complete system (in /etc/sysctl.conf) - but I don't want that.
We use qmail because of the antispam system spamdyke (with spamdyke control panel), which is a great antispam solution! In the spamdyke control panel I can see the complete mailtraffic in Plesk - this is awesome. Postfix doesn't offer such a system to me, so this is no alternative (or I don't know it yet).
I hope someone has a suggestion for me.
Greetings
Thomas
We have the problem with one of our servers at Host Europe, that the ipv6 address of the server ends up on a the SPAMHAUS CSS from time to time. More precisely not our address but the complete class-c net including our ipv6 address.
So I'm searching for the possibility the disable sending ipv6 via qmail.
The hint to type our ipv4 address in /var/qmail/control/outgoingip and to change it via iptables (iptables -t nat -A POSTROUTING -p tcp --dport 25 -j SNAT --to-source xxx.xxx.xxx.xxx) didn't work for our system (Plesk Obsidian 18.0.30 MU3 - Ubuntu 18.04.5 LTS) in this case.
I also know, that I can disable ipv6 in the complete system (in /etc/sysctl.conf) - but I don't want that.
We use qmail because of the antispam system spamdyke (with spamdyke control panel), which is a great antispam solution! In the spamdyke control panel I can see the complete mailtraffic in Plesk - this is awesome. Postfix doesn't offer such a system to me, so this is no alternative (or I don't know it yet).
I hope someone has a suggestion for me.
Greetings
Thomas
