Why we can send emails from gmail to yahoo or outlook but cannot do the same with instant messaging apps like WhatsApp to Messenger or iMessage?
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it’s the matter of protocol (the way that computers talk to each other). e-mail has been standardized something about 40 years ago (or even earlier) and it’s always the same. whereas IM have developed their own protocols which are not compatible. there is Jabber, AIM, ICQ, GG and probably a bunch of others i forgot/didn’t hear about.
in order to make different IM programs talk to each other (cross-protocol) you would have to have a translation layer (something like a middle-man) that would convert from one to another.
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