cd /usr/ports/mail/postfix
make clean
make config
  >>SASL<< auswählen
make install
make clean

vim /etc/rc.conf
  postfix_enable="YES"
  sendmail_enable="NONE"

vim /etc/periodic.conf
  daily_clean_hoststat_enable="NO"
  daily_status_mail_rejects_enable="NO"
  daily_status_include_submit_mailq="NO"
  daily_submit_queuerun="NO"

vim /usr/local/etc/postfix/main.cf
  mynetworks_style = host
  myorigin = example.com
  relayhost = [smtp.example.com]:465
  sender_canonical_maps = regexp:/usr/local/etc/postfix/sender_canonical
  smtp_sasl_auth_enable = yes
  smtp_sasl_mechanism_filter = plain, login
  smtp_sasl_password_maps = hash:/usr/local/etc/postfix/sasl_passwd
  #smtp_sasl_security_options = noplaintext, noanonymous
  smtp_sasl_security_options = noanonymous
  smtp_tls_security_level = secure
  smtp_tls_wrappermode = yes

touch /usr/local/etc/postfix/sender_canonical
chmod 0600 /usr/local/etc/postfix/sender_canonical
vim /usr/local/etc/postfix/sender_canonical
  /^.*$/ noreply@example.com

touch /usr/local/etc/postfix/sasl_passwd
chmod 0600 /usr/local/etc/postfix/sasl_passwd
vim /usr/local/etc/postfix/sasl_passwd
  [smtp.example.com]:465 username:P@ssw0rd

postmap /usr/local/etc/postfix/sender_canonical
postmap /usr/local/etc/postfix/sasl_passwd

service postfix restart

# Mail-Queue anzeigen:
mailq
postqueue -p

# Mails aus der Queue löschen:
postsuper -d ALL
postsuper -d "${QUEUE_ID}"

# Test-Mail abschicken (oneliner):
printf "From: sender@example.com\nTo: recipient@example.com\nSubject: Test\n\ntest body" | sendmail -t -i

# Test-Mail abschicken:
cat << "EOF" | sendmail -t -i
From: sender@example.com
To: recipient@example.com
Subject: Test

test body
EOF