Send email on Debian via Exim4 through a public SMTP server

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First run 

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sudo dpkg-reconfigure exim4-config

and use these config options:

  • General type of mail configuration: mail sent by smarthost; received via SMTP or fetchmail
  • System mail name: your hostname
  • IP-address to listen on for incoming SMTP connections: 127.0.0.1
  • Other destinations for which mail is accepted: your hostname
  • Machines to relay mail for: leave this blank
  • IP address or host name of the outgoing smarthost: mail.example.com::587
  • Hide local mail name in outgoing mail?
    • Yes - all outgoing mail will appear to come from your gmail account
    • No - mail sent with a valid sender name header will keep the sender’s name
  • Keep number of DNS-queries minimal (Dial-on-Demand)? No
  • Delivery method for local mail: choose the one you prefer
  • Split configuration file into small files? Yes (you need to edit one of the files next)

Then run sudo vi /etc/exim4/passwd.client and add the following lines for your mail host, and any aliases it has (found through nslookup). Substitute email address and password with the account you want to route mail through):

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mail.example.com:email address:password

Once you edit the passwd.client file, run sudo update-exim4.conf which will integrate your changes into your Exim4 config.

Run sudo systemctl restart exim4 and make sure that the service stops and starts properly. If the service is unable to restart, something probably went wrong when you edited the passwd.client file.

Now the configure has been finished.

We can use exim -v [email protected] to get in send process to send a test email.

If get in the editor mode, input these charaters:

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From: [email protected]
Subject: Foobar
Text Text Text

After inputing, press Ctrl+d to send test email.