Why is an email not a verifiable source in the WWW (wacky world of wikipedia)?

Surely if you send an email to a particular email address and someone responds from that same email address it is automatically verified?  Anyone can spoof an outgoing email address, but what can't be spoofed is someone receiving an email at a particular email address.  Hence if you received an email in response to an email you sent it is verified.

Ok, so you have to meet the high standards of wikepedia before you mention what Hans' real name is there.  I don't think this forum demands such high standards, so feel free to let us know what response you got please Andries.  And who responded.  SatPal or PremPal? Both?  Or maybe you have not got a response?

Thanks

T