Some useful Sendmail commands on Slackware.

Working with MC and CF files.

To edit the default /etc/mail/sendmail.cf

cd /usr/share/sendmail/cf/cf
cp sendmail-slackware.mc sendmail-new.mc
vim sendmail-new.mc

Make the desired changes and save the file. Issue these commands to create the cf file and copy it to /etc/mail.

m4 sendmail-new.mc > sendmail-new.cf
cp sendmail-new.cf /etc/mail/sendmail.cf

Multiple Domains

Make sure your sendmail-new.mc above includes

FEATURE(`use_cw_file')dnl'

Then edit /etc/mail/local-host-names and add the domains to it.

example.org
mail.example.org
www.example.org