[Shorewall-users] email delivery issues

[theluketaylor <eku...@gm...>]

I use shorewall to run the firewall/gateway for a small private school
I do some work for in my spare time as a volunteer.  After many years
of it running without incident I upgraded to the latest ubuntu and now
I cannot get our email delivery to work successfully.  I have no idea
what could be wrong, especially since I used the old shorewall
configuration files.  I also tried setting up a new configuration from
the example files in case some of the defaults or syntax had changed
but got the same result.

After extensive testing I have found from behind the firewall I can
log into the email server a list the messages contained on it but
cannot actually retrieve the messages.  Even increasing the shorewall
log level doesn't seem to provide any additional information.  I am
able to download the messages from the firewall itself which leads me
to believe the issue is with the masquerading but I am very much out
of my level with that and don't know how to go about tracking down the
issue