Since I'm fairly new at Linux and I have successfully got sendmail working on my server for my domain, I thought I would write this walkthrough to help others configure sendmail a fairly easy way.


TOOLS NEEDED:
- Slackware 9.1 w/ Sendmail installed (obviously)
- Webmin (http://www.webmin.com/) for web-based configuration


WEBMIN SETUP:
- Download and install webmin. It should have documentation with it, and it's fairly easy to setup.


M4 SETUP FOR SENDMAIL:
- CD /usr/share/sendmail/cf/cf
- MV * /usr/share/sendmail/cf
- CD /usr/share/sendmail/cf
- Makre sure everything got moved to /usr/share/sendmail/cf directory
- You should have M4 installed in /usr/share/sendmail/cf
- Run "m4 /usr/share/sendmail/cf/m4/cf.m4 /usr/share/sendmail/cf/sendmail-slackware.mc > config.cf "
- CP sendmail-slackware.mc config.mc (if config.mc exists, then to "CP config.mc config.mc.old" first to back it up)
- CP config.cf /usr/share/sendmail/cf/m4/config.cf


SETUP WEBMIN FOR M4:
- Go into Webmin (default is http://localhost:10000)
- Go to Servers > Sendmail Configuration
- Click on Module Config towards the top-left
- Full path to sendmail.cf = /etc/mail/sendmail.cf
- Sendmail M4 base directory = /usr/share/sendmail/cf
- Full path to M4 config file = /usr/share/sendmail/cf/config.mc
- Everything else should be fine so Save the changes


CONFIGURE M4 IN WEBMIN:
- In Webmin > Servers > Sendmail Configuration go to Sendmail M4 Configuration
- Go to Edit File Manually button
- In the list of FEATURE's add these lines:
FEATURE(`relay_local_from')dnl
FEATURE(`relay_entire_domain')dnl

-Make sure your "include" line looks like:
include(`/usr/share/sendmail/cf/m4/cf.m4')

-Make sure your "SMART_HOST" and "LOCAL_DOMAIN" line has your domain in it

-Then Save and Rebuild Sendmail Configuration

CONFIGURE SENDMAIL:
- Go to Sendmail Options in the Sendmail Configuration in Webmin
- For "Send outgoing mail via host" put in your domain for your mail server then Save and Apply
- Go to Local Domains and add localhost and your domain and Save
- Go to Domain Masquerading and for "Masquerade as domain" put in your domain and for "Domains to be masqueraded" put in your computer name and Save
- Go to Outgoing Domains and add your domain and Save
- Go to Spam Control and click on "Edit Manually" and add and save:
localhost RELAY
domain_name RELAY

- Go to Relay Domains and add your domain and Save

Now you probably want to Stop and Start Sendmail

...and that's it!!!


Since I lost part of my database I think these are all the steps. If something doesn't work or if I'm missing a step please let me know.