starttls(8) on OpenBSD

The text c0a44c440d6f, as OpenBSD 5.2, OpenBSD 5.1, OpenBSD 5.0, OpenBSD 4.9, OpenBSD 4.8, OpenBSD 4.7, OpenBSD 4.6, OpenBSD 4.5 shipped it.

ESMTP over TLS/SSL