[exim] TLS auth between SMTP servers for mail exchange

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Autor: s7r
Data:  
Para: exim-users
Assunto: [exim] TLS auth between SMTP servers for mail exchange
Hi,

I saw that almost all mail servers now support TLS encryption for mail
exchange connections from other servers.

I know the basics how SSL/TLS works for websites, how does it work for
SMTP? Who issues the certs? It's the same thing with trusted
certificate authorities - you have to buy a valid certificate signed
by a trusted authority and install it on your SMTP server so the mail
exchanged will be encrypted or how does it work?

If it's not a certification authority how are the certs verified and
how are the encryption keys exchanged in order to be sure you are
talking to the right end and there is no man-in-the-middle?

Thank you in advance & looking forward to receive your replies.
- --
s7r@???
PGP Public key: http://www.sky-ip.org/s7r@sky-ip.org.asc