SMTP authentication howto

[sawyl]

The trick to setting up SMTP client authentication with sendmail seems to be the following:

1. mkdir -m 700 /etc/mail/auth
2. vi /etc/mail/auth/client-info
3. Dump the following into the file: 'AuthInfo:smtphost.isp "U:localuser" "I:remoteuser" "P:smtppassword" "R:smtphost.isp" "M:DIGEST-MD5 CRAM-MD5 LOGIN PLAIN"' with the various bits and pieces tuned to reflect your setup.
4. cd /etc/mail/auth; makemap hash client-info < client-info
5. vi /etc/mail/sendmail.mc
6. Add 'FEATURE(`authinfo',`hash /etc/mail/auth/client-info')'
7. m4 sendmail.mc > sendmail.cf
8. kill -HUP `cat /var/run/sendmail.pid`

Easy when you know how...