This is a very old thread to revitalise but I trawled and trawled it for answers and it did not solve my little problem. In the end I had to resort to commercial support but looking back the answer is above but somewhat confused....
Internal PCI ISDN modem connecting to a dialup isp Onetel (UK) on a 5.5 box with update 2
When someone (ie support) was entering the e-smith box via PPTP the mail would collect and then when they broke the connection it stopped...... Take my hat off to Paul at LinuxIT - he solved it... down to the ^PPP command in /etc/startmail. An ISDN modem starts up an IPPP so this is not found by ^PPP because the ^ means that it must start with PPP not contain the letters PPP.
Remove the ^ and bingo - you have new mail.
Want to see what is going on.. swap the --silent --syslog in fetchmail for --verbose and the admin postbox should get an email of each successful connection.
Sam
Iam learning slowly, bear with me, stick with it, this one took me about 8 days of messin !