I’m using V5 Hosted invoiceninja. And invoice email gets send out from your server with my domain email as sender.
But my customers seem to get this message in their email:
CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
Probably I should set spf record to indicate that I let invoiceninja service sent email on behalf of my domain. But what should I include? Is it still in V5:
v=spf1 include:invoiceninja.com ~all