I do not have any issues with IPv6.
It works for me.

Ubuntu
======
opensmtpd 6.0.3p1-1ubuntu0.2

smtpd.conf lines:
listen on 0.0.0.0 port 25
listen on ::0 port 25

$ netstat -lnt | grep ':25'
tcp        0      0 0.0.0.0:25              0.0.0.0:*               LISTEN
tcp6       0      0 :::25                   :::*                    LISTEN


OpenBSD
=======
version: OpenSMTPD 6.7.0

smtpd.conf lines:
listen on all tls pki example.pki


On Wed, 22 Jul 2020 16:34:25 +0200
Harald Dunkel <harald.dun...@aixigo.com> wrote:

> Hi folks,
> 
> I've got a problem with IPv6 support for opensmtpd 6.7.1p1 on
> Debian: Apparently opensmtpd seems to ignore IPv6 after a reboot.
> 
> My smtpd.conf says
> 
> :
> xname = "mailhost.example.com"
> pki $xname cert               "/etc/mail/ssl/mailhost.example.com.cert"
> pki $xname key                "/etc/mail/ssl/mailhost.example.com.key"
> 
> listen on lo  tls pki $xname
> listen on eth0        tls pki $xname
> :
> 
> lsof -p shows that smtpd is listening only on the IPv4 address on
> eth0. The IPv6 addresses bound to eth0 (link-local and global) are
> ignored.
> 
> If I *restart* smtpd, then it is listening on IPv6 as well, up to
> the next prefix change propagated via router advertisement. The
> IPv6 address with the new prefix is ignored. When the old prefix
> expires, then opensmtpd is back to IPv4-only. I have to restart
> it again.
> 
> Can anybody reproduce this?
> 
> 
> Every helpful comment is highly appreciated.
> 
> Regards
> Harri
> 


-- 
with best regards,
Slavik Svyrydiuk

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