Postfix

visit www.postfix.org

Notes on using Postfix . Quick and dirty procedure for setting up Postfix on a new machine that needs email.

Setting up Postfix

Add Postfix Mail Transfer Agent as satellite smarthosting through Google, install mail utilities, setup an alias for root's mail and test it all

1.  sudo su -
   

2.  apt-get install postfix
   

3.  apt-get install bsd-mailx
   # or 
   apt-get install mailutils
   

4. cat <<HERE | sudo tee /etc/postfix/main.cf > /dev/null
   # work-around for Digital Ocean's blocking of IPv6 for email
   smtp_bind_address = 0.0.0.0
   # satellite configuration
   smtp_use_tls = yes
   smtp_sasl_auth_enable = yes
   smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
   smtp_sasl_security_options = noanonymous
   smtp_sasl_tls_security_options = noanonymous
   
   HERE
   

5.  echo "smtp.gmail.com me@example.com:PASSWORD" > /etc/postfix/sasl_passwd
   

6.  postmap /etc/postfix/sasl_passwd
   

7.  chmod 640 /etc/postfix/sasl_passwd*
   

8.  chown postfix:postfix /etc/postfix/sasl_passwd*
   

9.  /etc/init.d/postfix restart
   

10.  echo "root: me@example.com" >> /etc/aliases && newaliases
    

11.  echo test |mail -s "test mail sent to external" greg.rundlett@gmail.com
    

12.  echo test |mail -s "test mail sent to root" root
    

Security

https://drownattack.com/postfix.html illustrates how to secure your Postfix installation against weak encryption.

Version

Run postconf -d | grep mail_version to find out your Postfix version.