read the " guidelines for submitting a review " thoroughly before submitting one..your answer is there..

all fields must be filled Except those with an asterisk. That is the opposite of many online forms however there it is. The provider's e-mail address is not required.

However, a means of contact is required. Either an email address, phone number, or pager. Of course pager is kind of silly now as noone uses ghem anymore (but they were still common when TER started). In any case you do need at least one of those fields filled in, but not all.