postfix: Update SSL cert/key paths.

Signed-off-by: Maximilian Wilhelm <max@sdn.clinic>

postfix/main.cf.mail.in.ffho.net

@@ -18,8 +18,8 @@ append_dot_mydomain = no
 readme_directory = no
 
 # TLS parameters
-smtpd_tls_cert_file=/etc/ssl/certs/mail.ffho.net.crt
-smtpd_tls_key_file=/etc/ssl/private/mail.ffho.net.key
+smtpd_tls_cert_file=/etc/ssl/certs/mail.ffho.net.cert.pem
+smtpd_tls_key_file=/etc/ssl/private/mail.ffho.net.key.pem
 smtpd_use_tls=yes
 smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
 smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache