When I am using go high level and I try to send an email outlook says on the from "team=gentlebirth.com@emailparents.gentlebirth.com on behalf of Sara" instead of team@gentlebirth.com like it does for google. Hence, it is likely people will find it "suspicious".

It would be interesting to consider the approach that sendgrid uses which is to "authenticate single senders" so that this does not happen. Any other way to solve the problem is also welcomed.