In order to bypass the problem I did this after having edited dialup.m4 manually:
# cd /etc/mail/m4 # mv dialup.m4 dialup-good.m4 # ln -s dialup-good.m4 dialup.m4
I don't know why, but the function update_host() in /usr/share/sendmail/dynamic, which is responsible for creating dialup.m4, refrains from touching it if it is a symbolic link.
In order to bypass the problem I did this after having edited dialup.m4 manually:
# cd /etc/mail/m4
# mv dialup.m4 dialup-good.m4
# ln -s dialup-good.m4 dialup.m4
I don't know why, but the function update_host() in /usr/share/ sendmail/ dynamic, which is responsible for creating dialup.m4, refrains from touching it if it is a symbolic link.