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Use this for personal machines behind someone else's LAN. It turns exim into a MUA instead of a MTA. That is, tt uses your remote self-hosted smtp instead of sending directly.

sudo apt install exim4
sudo nano /etc/exim4/update-exim4.conf.conf
dc_eximconfig_configtype='smarthost'
dc_smarthost='mail.domain.com::587'
dc_local_interfaces='127.0.0.1 ; ::1'
dc_other_hostnames=''
dc_readhost=''
dc_relay_domains=''
dc_minimaldns='false'
dc_hide_mailname='true'

sudo nano /etc/exim4/passwd.client
mail.domain.com:user:password
*:user:password

sudo chown root:Debian-exim /etc/exim4/passwd.client
sudo chmod 640 /etc/exim4/passwd.client

#calm tls
sudo nano /etc/exim4/exim4.conf.localmacros
MAIN_TLS_ADVERTISE_HOSTS =
REMOTE_SMTP_SMARTHOST_HOSTS_REQUIRE_TLS = *

sudo update-exim4.conf
sudo systemctl restart exim4

echo "Test after permission fix" | mail -s "Exim4 test 2" oemb1905@jonathanhaack.com
sudo tail -f /var/log/exim4/mainlog

sudo apt install exim4 cat « 'EOF' | sudo tee /etc/exim4/update-exim4.conf.conf dc_eximconfig_configtype='smarthost' dc_smarthost='mail.domain.com::587' dc_local_interfaces='127.0.0.1 ; ::1' dc_other_hostnames=dc_readhost= dc_relay_domains='' dc_minimaldns='false' dc_hide_mailname='true' EOF

cat « 'EOF' | sudo tee /etc/exim4/passwd.client mail.domain.com:user:password *:user:password EOF

sudo chown root:Debian-exim /etc/exim4/passwd.client sudo chmod 640 /etc/exim4/passwd.client

cat « 'EOF' | sudo tee /etc/exim4/exim4.conf.localmacros MAIN_TLS_ADVERTISE_HOSTS = REMOTE_SMTP_SMARTHOST_HOSTS_REQUIRE_TLS = * EOF

sudo update-exim4.conf sudo systemctl restart exim4

echo “Exim4 configured and restarted.” echo “Test with:” echo 'echo “Test from $(hostname)” | mail -s “Exim4 test from $(hostname)” test@gmail.com'

— oemb1905 2026/03/29 15:33

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