For email integration with Mailgun, do we have any way to verify domain for Outsystems website?
I have been using https://postmarkapp.com/ which allows custom verification of sender email addresses and domains.
They provide 25'000 emails on the free plan and only support transactional emails so no mass mailing.
A customer mail server can be created per environment and you can send emails via REST.
I have not used any of the other functionality that they provide.