Debian nullmailer
Last update
2025-09-05
2025
09-05
«uninstall exim and install a simple forwarder daemon»
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apt install nullmailer

echo your_hostname > /etc/mailname
cd /etc/nullmailer
echo -n             > defaultdomain
echo receiver@a.com > adminaddr
echo sender@b.com   > allmailfrom 
echo 'server.net smtp --port 587 --auth-login --user=username --pass=password' > remotes

systemctl restart nullmailer

Source: debian wiki