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Whenever it is necessary to send e-mails from the Endian Hotspot Appliance (for example for event notifications or to use the SmartConnect functionality with emails), it can be a problem in case the Internet connection has a dynamically assigned IP address, like an ISDN or an ADSL dialup Internet connection. Indeed, the uplink’s IP address might have been blacklisted by some Realtime Blacklist (RBL) and therefore the remote mailserver might refuse connections from the Endian Hotspot Appliance.

The SMTP proxy allows to send emails through a known SMTP server (also known as smarthost) that could be provided by the Internet connection provider or by another third party.


When an external smarthost is configured, neither the SSL/TLS nor the STARTTLS protocols can be used.

Smarthost configuration

Smarthost for delivery

Tick this checkbox to enable a smarthost for delivering e-mails and to show additional options.

Smarthost address

The IP address or hostname of the smarthost.

Smarthost port

The port on which the smarthost is listening, defaults to 25.

Smarthost authentication

Tick this checkbox if the smarthost requires authentication. The next three extra options are then shown.

Smarthost username

The username used for authentication on the smarthost.

Smarthost password

The password used for authentication on the smarthost.

Choose authentication method

The authentication methods required by the smarthost: PLAIN, LOGIN, CRAM-MD5, and DIGEST-MD5 are supported. Multiple methods can be chosen by ticking the checkboxes in the multiselect drop-down menu.

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