TLS
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externe Dokus
http://tools.ietf.org/html/rfc4346#section-7.4.1.2
You can test tunneled TLS connections to port 465 with:
openssl s_client -connect hostname:465
You can test STARTTLS connections on port 25 or 587 with:
openssl s_client -connect hostname:587 -starttls smtp