Hey,
I had this issue too. Turns out that there’s actually a hidden option to disable email validation, which totally fixed the issue for me.
The only problem is finding it.
You have to go into the Postman SMTP settings > open the developer console (Inspect element in Chrome”) > search for “disable_email_validation” > change the CSS so that you can see it and then check the checkbox.
Not sure why it’s not visible in the first instance but this is a definite fix!!
