To allow Netigate to send emails on your behalf, you will have to add them to your SPF record. The SPF mechanism used by Netigate is shown below.
Swedish server: _spf.netigate.se
German server: _spf.ntgt.de
You can configure DKIM support through Netigate to learn more please see the button below.
Create a free OnDMARC account to test your configuration.