Update settings for email.it

[cketti]

It looks like the provider recently changed its business model and server settings. See https://www.email.it/welcome and https://www.email.it/faq.

I verified the server settings using:

openssl s_client -connect in.email.it:993 -crlf -verify_hostname in.email.it -ign_eof <<EOF
1 ID ("name" "autoconfig.test")
EOF

openssl s_client -connect pop.email.it:995 -crlf -verify_hostname pop.email.it -ign_eof <<EOF
CAPA
EOF

openssl s_client -connect out.email.it:465 -crlf -verify_hostname out.email.it -ign_eof <<EOF
EHLO autoconfig.test
EOF

Closes #116

[babolivier]

LGTM otherwise.