Christophs outsourced brain https://www.hackerbruecke.net/ Sun, 12 Apr 2026 16:35:39 +0000 FeedCreator 1.8 https://www.hackerbruecke.net/_media/wiki/favicon.ico https://www.hackerbruecke.net/ https://www.hackerbruecke.net/linux/email/postfix/pfs?rev=1493132175&do=diff Postfix Perfect Forwarding Secrecy (PFS) openssl gendh -out /etc/postfix/dh_512.pem -2 512 openssl gendh -out /etc/postfix/dh_1024.pem -2 1024 postconf -e "smtpd_tls_dh1024_param_file = /etc/postfix/dh_1024.pem" postconf -e "smtpd_tls_dh512_param_file = /etc/postfix/dh_512.pem" postconf -e "smtpd_tls_eecdh_grade = strong" postconf -e "tls_preempt_cipherlist = yes" postconf -e "smtpd_tls_loglevel = 1" postconf -e "smtp_tls_loglevel = 1" postfix reload anonymous@undisclosed.example.com (Anonymous) Tue, 25 Apr 2017 14:56:15 +0000 https://www.hackerbruecke.net/linux/email/postfix/tipps?rev=1493132245&do=diff Postfix Tipps und Tricks Mails aus Mailqueue löschen alle Mails des Benutzers station7@example.com aus der Mailqueue löschen: mail:~# mailq | tail -n +2 | grep -v '^ *(' | awk 'BEGIN { RS = "" } { if ($7 == "station7@example.com") print $1 }' | tr -d '*!' | postsuper -d - anonymous@undisclosed.example.com (Anonymous) Tue, 25 Apr 2017 14:57:25 +0000 https://www.hackerbruecke.net/linux/email/postfix/relayhost?rev=1493132193&do=diff Postfix configuration for a relayhost (MX) / Anti-SPAM-/UCE-settings smtpd (smtp + daemon) = server = Postfix receives mail from a client smtp = client = Postfix sends mail to another mailserver used Ports: 10023/tcp: postgrey 10024/tcp: amavisd-new 10025/tcp: policyd-weight anonymous@undisclosed.example.com (Anonymous) Tue, 25 Apr 2017 14:56:33 +0000 https://www.hackerbruecke.net/linux/email/postfix/config_test?rev=1493132127&do=diff Postfix-Konfiguration testen Die Postfix-Konfigurtation sollte auf alle fälle vor der Produktivnahme ausgiebig getestet und das Verhalten beobachtet werden! Test von main.cf und master.cf Test der Datei- und Verzeichnisrechte, sowie die Syntax von main.cf und master.cf von Postfix: anonymous@undisclosed.example.com (Anonymous) Tue, 25 Apr 2017 14:55:27 +0000 https://www.hackerbruecke.net/linux/email/postfix/ssh-smtp-tunnel?rev=1493132228&do=diff SMTP-over-SSH-Tunnel Um zwei SMTP-Server (z.B. Mailserver im Heim-Netz zu Mailgateway bei Provider/Hoster) sicher miteinander zu verbinden, gibt es verschiedene Möglichkeiten. OpenVPN-Tunnel Eine Möglichkeit ist, ein OpenVPN-Tunnel zwischen beiden Servern. anonymous@undisclosed.example.com (Anonymous) Tue, 25 Apr 2017 14:57:08 +0000 https://www.hackerbruecke.net/linux/email/postfix/smtp-authentication?rev=1493132210&do=diff SMTPd- / SMTP-authentication SMTPd-authentication SASL must be configured! in /etc/postfix/main.cf: smtpd_sasl_auth_enable = yes smtpd_sasl_security_options = noanonymous broken_sasl_auth_clients = yes smtpd_recipient_restrictions = ... permit_sasl_authenticated anonymous@undisclosed.example.com (Anonymous) Tue, 25 Apr 2017 14:56:50 +0000