C.8. Faxserver Mail2Fax Configuration

Using NGCP Faxserver’s Mail2Fax service requires the configuration of sip:carrier’s local mail server that is Exim. It has to be configured in a way that it can receive mails from outside of the server, because Exim by default listens only on the local interfaces for incoming mails.

Exim Configuration

The NGCP platform administrator must reconfigure Exim in order to enable receiving e-mails for fax sending:

dpkg-reconfigure exim4-config

PLEASE NOTE: When entering configuration data the following points must be kept in mind:

operation mode has to be set to "mail sent by smarthost; no local mail"
"mail2fax.example.org" must be added to accepted domains, where "example.org" is the domain name of the NGCP platform operator
the appropriate answer to the wizard question: "Split configuration into small files?" is Yes, otherwise the Mail2Fax feature may not work properly
Alternatively you have to set the dc_use_split_config parameter to true in the /etc/exim4/update-exim4.conf.conf file. Afterwards restart exim so that the new configuration takes effect.

DNS Configuration

It is necessary to add a subdomain starting as mail2fax. to the list of domain names. That is where the faxes will be sent by users to trigger Mail2Fax service.


	Alternatively, edit `/etc/ngcp-config/templates/etc/exim4/conf.d/router/999_mail2fax.tt2` file and adjust it to your personal preferences. Although this is not recommended and should only be done by Sipwise support engineers.


	Alternatively you have to set the `dc_use_split_config` parameter to `true` in the `/etc/exim4/update-exim4.conf.conf` file. Afterwards restart exim so that the new configuration takes effect.