[Users] Disable IPv6

[Marco]

Am Sat, 16 Jul 2022 12:44:08 -0400
schrieb Edward <epp at caramail.com>:

> On 7/16/22 10:51, Marco wrote:
> > Am Sat, 16 Jul 2022 07:20:31 -0400
> > schrieb Edward <epp at caramail.com>:
> >  
> >> I am familiar with A and AAAA records. The IMAP server is running
> >> Dovecot and DNS is showing it has has 16 IPv4 addresses. Apart
> >> from an online support forum, there is no direct way to contact
> >> the server admins.  
> > Does it also have AAAA records?
> > Why don't you tell us the domain name, we might check it.  
> 
> Yes, it also has AAAA records: imap.comcast.net
This is one of them that doesn't work:
imap.ge.xfinity.com.    8       IN      AAAA
2001:558:fc0a:3:f816:3eff:fee8:1979

m at ryz:~$ telnet 2001:558:fc0a:3:f816:3eff:fee8:1979 25
Trying 2001:558:fc0a:3:f816:3eff:fee8:1979...
telnet: Unable to connect to remote host: Connection refused
m at ryz:~$ 

It is their fault, so tell them instead of disabling IPv6, which is a
very bad idea.