Hi,
You can put in the hosts file (/etc/hosts) of the box running squid an entry:
Code:
192.168.1.12 mail.mydomain.com
so squid is not going to ask dns for resolving your mail server.
Or, (better solution if possible) setup a dns server using different views for internal and external hosts.
Btw my previous post was just for avoiding the downtime of the whole procedure to stop squid, delete cache, recreate it and restart squid
Regards