World of Warcraft addon, "CrossChat", lets you send whispers to Horde (enemy) or Alliance players.
just target someone and type /cc
or you can also be like
/cc Frank-RiceFields
or
/crosschat Frank-RiceFields
if you want to whisper Frank from the RiceFields realm
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You can whisper the other faction.
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They can reply back to you (they don't need addon)
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You can ignore and report them if they are rude
Frank is horde but you are alliance. You are Ethan. Here is Frank's screen
[Crosschatbot] whispers: [Ethan]: truce? I will ask my guildies to stop camping you if you leave m'lady alone
to [Ethan]: truce!! sounds like a deal. Sorry I killed her :^) she took my ore! haha xD XD
[Crosschatbot] whispers: [Ethan]: No big deal pal :) Just don't do it again
Here is your screen:
to [Frank]: haha XD she's a girl so you should know better than to attack her like that -.-'
[Frank] whispers: Cx my bad buddy i just assumed it was a little kid. Sorry for the misunderstanding
to [Frank]: don't talk to me or my son ever again XD
It's cool because they don't need the addon to message you back