I've imported Sendmail 8.13.7, plus two patches, one for shared memory issues and one that fixes an issue where the PID file might be removed. Together I'm calling this 220.127.116.11.
There's a web interface to the repository available. This makes it easy to see what's changed and when. You can also subscribe to an RSS feed of changes as and when I make them.
If you want to checkout the code and build it then configure your Subversion client to check out from this URL:
For example, if you're using the command line client on Unix you might do something like the following (broken over several commands to keep the line lengths down).
% export REPO=svn://jc.ngo.org.uk/nik
% svn checkout $REPO/sendmail/branches/18.104.22.168-dtrace
% cd 22.214.171.124-dtrace