[bullrico]

They can use their own email address, although a temporary @impressar.io address is built-in - just to add a layer of protection (against spam). If you reply to the @impressar.io address, it gets shown in the Messages section.

[tylerwl]

Excellent. I would just add a line to the Features page like:

Custom email address - Promote your personal brand by using an @yourdomain.com email address.