A directive from the UN NSA that Baha'is should refrain from using "Baha'i words" as the account name in email addresses.
It is not entirely clear to me what is meant by an "e-mail domain address," as a domain has the same name whether it forms part of a URL or part of an email address (e.g. "firstname.lastname@example.org" or "email@example.com" vs. "www.bahai.com/someaddress"). It seems that the intended guidance is that one should not choose email account names containing key Baha'i terms, e.g. "firstname.lastname@example.org" would be disallowed. [-J.W.]
See also a WIPO legal ruling finding that "Baha'i" is a trademarked term and cannot be used fraudulently in domain names.