exim

[Samik]

TLS error on connection from [X.x.x.x] (gnutls_handshake): A TLS packet with unexpected length was received.
debian 7.x

in the old version vesta cp all work

[skurudo]

You can try as root, run dpkg-reconfigure exim4-config
(you don't need to change anything)

and you can check file permission for certificates.