Re: Debian 11: How to disable IPv6

[Greg Wooledge <greg@wooledge.org>]

On Sat, Jul 09, 2022 at 04:52:27PM +0200, Roger Price wrote:
>  Jul 09 10:22:57 titan fetchmail[7286]:
>                  Connection errors for this poll:
>                  name 0: connection to localhost:smtp [127.0.0.1/25] failed:
>                  Connection refused.
>                  name 1: connection to localhost:smtp [127.0.0.1/25] failed:
>                  Connection refused.

Find out what's going on with your MTA.  You could start with

ss -lnt | grep :25

to see what's listening on port 25, if anything, and which address(es)
it's listening on.

If you don't see anything listening on port 25 at all, then perhaps your
MTA is simply not running.  Use "systemctl status exim4" or whatever
package/service your MTA uses.  (I don't use exim4, so I don't know its
service name.)

If you don't get helpful error messages out of that, try running it as
root.  Sometimes that gives more information.

Also check exim4's configuration, and make sure it has been told to run,
and to listen on port 25 of *all* interfaces.