How can I keep email privacy for friends plugin?

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I don’t want friends searches to give back a list for email pattern matches, only results for public info like username or public profile stuff. What’s the best way to still invite or friend by email address, but not return a list of members that match address patterns? I think members would feel more secure not having usernames returned for email address searches for bigger sites. I’m trying to do something like invite and friends, where someone can send a friend request/invite knowing email address but not return a list, like friending someone that may or may not be on the site and that may or may not want you to know their user id.

thank you!