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Think of it like cellphones. If you aren't in the contact list you are blocked by default.

• beowulfey 6y ago
  There was a time not that long ago when we didn’t have caller ID and we actually answered ALL our phone calls
• tsimionescu 6y ago
  That's not at all how my cellphone works. This has been thankfully the case recently when a hospital contacted me to notify that they had admitted my grandmother. It's not safe to block calls from unknown numbers if you have people that may depend on you. Email is much less likely to be critical, but there are still occasions when you may be contacted with important information by addresses you didn't think to white list.
• FiveNinjas 6y ago
  you mean like Skype. There's nothing specially 'email' about this other than it is a bad mix up of a P2P communication app and a supposedly 'trusted' version of SMTP.
• hyakosm 6y ago
  It's the difference between a social network decicated to exchange in a bubble and a truly universal communication service like post, phone system or email where anyone can reach anyone without subscribe to same/any service, without being "friend" or trusted.