Yet another reminder to myself how to use Gmail as SMTP-service.

Start with installing postfix. Just do the usual:

sudo aptitude install postfix

Select the following settings to start with during installation. Adjust according to your needs.

General type of mail configuration: SatelliteSystem
System mail name:  yourhostname
SMTP relay host (blank for none): smtp.gmail.com:587 
Root and postmaster mail recipient: sysadmins 
Other destinations to accept mail for (blank for none): yourhostname, localhost, localhost.localdomain 
Force synchronous updates on mail queue? No Local networks: 127.0.0.0/8 
Mailbox size limit (bytes): 0 
Local address extension character: + Internet protocols to use: ipv4 eller ipv6 beroende på vad som används

If you ever need to redo the configuration run:

sudo dpkg-reconfigure postfix

Edit /etc/postfix/main.cf by adding the following rows:

smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous
smtp_use_tls = yes

Create the file /etc/postfix/sasl_passwd with the following content:

smtp.gmail.com:587      your_account@gmail.com:password

When done run and restart postfix afterwards:

sudo postmap /etc/postfix/sasl_passwd
sudo service postfix restart

Now check you mail configuration by sending a mail to your own mailbox:

mail -s "Test" your_email@domain.com