HOWTO Setup Nullmailer

From the authour's web-site: Nullmailer is a mail transport agent designed to only relay all its messages through a fixed set of "upstream" hosts. It is also designed to be secure.

Install Nullmailer

# emerge nullmailer -va

Configuration

Edit the following files to configure the machine to send mail to our mailing server (Bismarck).

/etc/nullmailer/adminaddr

admin@siat.sfu.ca

/etc/nullmailer/defaultdomain

iat.sfu.ca

/etc/nullmailer/me

$hostname.iat.sfu.ca

/etc/nullmailer/remotes

bismarck.iat.sfu.ca smtp

Status

hostname ~ # mailq

Testing

Send a message to root, then wait a while for it to be picked up and sent onwards.

hostname ~ # 'mail -s "this is a nullmailer test from tirpitz" root
Type your message, complete it with a ctrl-D + Enter