SMTP Simple Mail Transfer Protocol

OpenSMTPD auf Slackware 15.0

Vorbereiten

https://slackbuilds.org/repository/15.0/network/opensmtpd ↗

root@server

# groupadd --gid 270 smtpd

# useradd --uid 270 --gid 270 --system --shell /bin/false --home-dir /var/empty smtpd

# groupadd --gid 271 smtpq

# useradd --uid 271 --gid 271 --system --shell /bin/false --home-dir /var/empty smtpq

Installieren

https://paketspiegel.de/opensmtpd.html ↗

root

# vi /etc/rc.d/rc.local

+ if [ -x /etc/rc.d/rc.opensmtpd ] + then + + source /etc/rc.d/rc.opensmtpd start + + fi

# chmod +x /etc/rc.d/rc.opensmtpd

Konfigurieren

root

# vi /etc/opensmtpd/smtpd.conf

+ pki mail.example.com cert "/root/.acme.sh/mail.example.com_ecc/fullchain.cer" + pki mail.example.com key "/root/.acme.sh/mail.example.com_ecc/mail.example.com.key"

− listen on localhost + #listen on localhost + listen on <Internetprotokolladresse> tls pki mail.example.com auth-optional

+ match from any for domain "example.com" action "local"

+ match from local for domain "mail.example.com" action "local"

− match for local action "local" + #match for local action "local" − match from local for any action "relay" + #match from local for any action "relay"

+ match auth from any for any action "relay"

root

# vi /etc/opensmtpd/aliases

− postmaster: root + #postmaster: root + postmaster: <Benutzer>

# newaliases

root

# vi /etc/opensmtpd/mailname

mail.example.com

root

# chmod 755 /var/mail

# chmod 755 /var/spool/mail

Verifizieren

root

# /etc/rc.d/rc.opensmtpd testconf

# /etc/rc.d/rc.opensmtpd stop

# /etc/rc.d/rc.opensmtpd start

benutzer@desktop

$ openssl s_client -connect mail.example.com:25 -starttls smtp | openssl x509 -dates -noout