Postfix SMTP – Configuring Outgoing Only SMTP Server on Debian

configurationdebianpostfixsmtp

I want to setup an outgoing only SMTP server on Debian, so my Web-applications will be able to send e-mails via it. I don't want to use another hosts because of security and customizability of my own setup.

I wish to install Postfix and configure it only in the outgoing mode (I don't want it to be a relay). So I want to ask an advice how to do it in the best way. There's no need in users, virtual users, endpoints and other options Postfix provides. I suppose I should only attach Postfix to some hostname, so my IP address can resolve to it.

I also think Postfix can be a bit complicated solution for this task. If you know much simpler tool for it, let me know.

Best Answer

To setup Postfix on Debian for outgoing mail only:

dpkg-reconfigure postfix (Select internet site when prompted)
postconf -e 'inet_interfaces = 127.0.0.1'
/etc/init.d/postfix restart

inet_interfaces = 127.0.0.1 in /etc/postfix/main.cf will bind Postfix to localhost only, so your machine won't accept incoming email.

Related Solutions

Postfix to relay mails to other SMTP for particular domain

If you want to send to a server other than what say the MX records in DNS for a domain, you can add a line in /etc/postfix/transport:

abc.com        smtp:mail.xyz.com

Then run postmap /etc/postfix/transport.

If it isn't already, add transport_maps = hash:/etc/postfix/transport to /etc/postfix/main.cf and run postfix reload.

Mysql – Postfix smtp relay with thesql autentification. How to

you can easily integrate postfix with dovecot sasl, and interface dovecot with MySQL. Have a look at: http://wiki2.dovecot.org/HowTo/PostfixAndDovecotSASL and http://workaround.org/ispmail

I successfully use postfix+dovecot sasl with password file authentication:

dovecot cfg:

protocols = none
listen = 127.0.0.1
first_valid_uid = 89
auth_verbose = yes
auth default {
  mechanisms = plain login
  passdb passwd-file {
    args = /etc/postfix/smtpd.auth.passwd
  }
  userdb static {
    args = uid=89 gid=89 home=/var/mail/null/
  }
  user = root
  count = 5
  socket listen {
    client {
      path = /var/spool/postfix/private/auth
      mode = 0660
      user = postfix
      group = postfix
    }
  }
}

part of postfix cfg:

smtpd_recipient_restrictions =
        permit_mynetworks,
        permit_sasl_authenticated,
        reject

# postfix-dovecot SASL options
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_sasl_tls_security_options = $smtpd_sasl_security_options
# report sasl login name in Received: message headers
smtpd_sasl_authenticated_header = yes

# TLS/SSL configuration
smtpd_tls_cert_file = /etc/postfix/ssl/server-cert.pem
smtpd_tls_key_file = /etc/postfix/ssl/server-key.pem
###cat server_cert.pem intermediate_CA.pem > server.pem
#smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem
smtpd_tls_received_header = yes
smtpd_tls_security_level = may
smtpd_use_tls = yes

Best Answer

Related Solutions

Postfix to relay mails to other SMTP for particular domain

Mysql – Postfix smtp relay with thesql autentification. How to

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