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By default, all notifications are sent from firstname.lastname@example.org which may be undesirable when white labeling our service. In the Account Branding settings, it is possible to set a "Custom From Email" address for notifications to be sent from. To do this, there is setup DNS setup required from your end.
If you don't have an SPF record yet, you'll need to add one for your domain. At a minimum, the value should be the following if you're only sending mail through Call Tracker for that domain:
v=spf1 include:spf.calltracker.io ?all
If you already have an SPF record for your domain, you just need to add include:spf.calltracker.io to the list of allowed sending domains.