Kopano Gateway IMAP(s) and POP3(s) not listening on IPv4

bongo

Hi,

i installed kopano 8.7.0-3 on debian 10 from the official repo nearly like huerter.me, added amavisd with clamav + spamassassin and added letsencrypt. It looks everything is working perfect. Now i want to use imap(s) and pop3(s) but after activating all in gateway.cfg the service kopano-gateway is not listening at ipv4 but only ipv6.

pop3_listen = *:110
pop3s_listen = *:995
imap_listen = *:143
imaps_listen = *:993
ssl_private_key_file = /etc/kopano/gateway/privkey.pem
ssl_certificate_file = /etc/kopano/gateway/cert.pem

Even after activating logging with debug level 6 the log is nearly empty and no problem is shown.

Did i miss something?

thank you

bongo

Found it, service has to listen on 0.0.0.0:[port]

pop3_listen = 0.0.0.0:110
pop3s_listen = 0.0.0.0:995
imap_listen = 0.0.0.0:143
imaps_listen = 0.0.0.0:993

fbartels

@bongo hmm… I have not tested this recently, bit afair *:port should listen on both ipv4 and ipv6. Of you cannot reproduce the issue with our packages I would recommend to open an issue on the Debian bugtracker.

More info https://forum.kopano.io/topic/2682/kopano-packages-from-native-distribution-repositories-e-g-debian-10-and-ubuntu-18-04/

jengelh

In versions before 8.7.82.115, * is resolved to just one socket (IPv6, which is multiprotocol by default). If you have the net.ipv6.bindv6only sysctl set to 1 however, that would be an IPv6-only socket. In that case, ss -lnpt will also show [::]:143 instead of *:143 to reflect just that.