On Wed, 8 Feb 2012 17:09:51 -0600 Les Mikesell <lesmikesell at gmail.com> wrote: > On Wed, Feb 8, 2012 at 12:36 AM, Kumar Krishna > <krishnak5891 at gmail.com>wrote: > > > > > Yes, I did restarted postfix. > > I ran tcpdump on the mail server while connecting to it from a > > remote location and then analysed the dump file. It seems that the > > server is working fine and offering STARTTLS, but the Cisco Router > > en route is messing things up. > > > > A normal router shouldn't interfere. Is this a PIX or ASA firewall? > I haven't used one for a few years but you used to have to do a > > no fixup protocol smtp 25 > > to get them to pass things correctly. > I believe it is a PIX or ASA firewall.