When I set up an email address, DH gives me a link to a secure webmail site [https://webmail.DOMAIN.com]
Whereupon Chrome gives me a Privacy Warning: *"This server could not prove that it is webmail.pequannockhistory.org; its security certificate is from .dreamhost.com. This may be caused by a misconfiguration or an attacker intercepting your connection."
I thereupon installed the Let’s Encrypt (free) SSL certificate, but get the same result.
I’m sure others have run into this but I haven’t found a solution in the Forums.