Receiving email via ETRN

ETRNExtended Turn is an extension to SMTP that enables you to forward messages to another SMTP server. is a command of SMTPSimple Mail Transport Protocol - An internet standard used for email transmission across IP networks. protocol. It serves for requesting emails stored on another SMTP server (usually secondary or tertiary SMTP servers).

Configuring the ETRN account

  1. In the administration interface, go to section Configuration > Delivery > ETRN Download.
  2. Click Add. The Add ETRN Account dialog opens.
  3. Type the server name, domain names (can be separated by semi-colon).
  4. If authentication is required, type the username and password.
  5. Click OK.
  6. Schedule an action for the ETRN download.

Forwarding email

If you set up a backup mailserver for your domain, you can use the ETRN command to forward messages from the backup server to your primary server.

  1. On your primary server, enable and schedule sending of the ETRN command.
  2. Go to Configuration > Domains and double-click the backup server.
  3. On the Forwarding tab, select If the recipient was not found in this domain, forward the message to another host.
  4. Type the primary server hostname and port.
  5. Select Offline - delivery is triggered by ETRN command from remote host.
  6. Click OK.

The primary server queries the backup server regularly using the ETRN command.