Hi @robin b 👋, Welcome to Interconnect
In this case, you should add the custom e-mail address to Intercom.
1. Go to Outbound -> Messages -> Emails -> New email
2. Click on the From list and select Add custom address
3. Fill the following form and click confirm
Once you fill Intercom will send a confirmation e-mail, when you confirm you can use the following address for outbound e-mail sending.
There is also a second option available for custom e-mail sending, you can read more about it here.
I hope this will be helpful, Let me know if you have any further questions about this topic.
Best,
Roy