After my last upgrade I went into serious problems with sendmail-mta simply refusing to send email and emitting the following error message:
/usr/lib/libdb-4.5.so: no version information available
Unfortunately my debian package system was not able to resolve the problem by itself. After digging into the matter I found out that the problem is apparently that libdb-4.5 in lower versions (prior to 4.5.5) uses no proper symbol versioning.
Another symptom was the following message:
> /etc/init.d/sendmail status MSP: is run via cron (20m) MTA: is not running QUE: Same as MTA
showing that MTA is obviously not running.
So I went for a manual upgrade of libdb-4.5 (to version 4.5.7 in my case) by downloading the deb-package from here and doing an
> dpkg --install libdb4.5_4.5.20-7_i386.deb
After that I simply restarted sendmail
> /etc/init.d/sendmail restart
and the problem disappeared.
If this post helped you, leave me a message.