* won't start its handshake until the client gets this line. Currently,
* we assume the write will not block here; this is usually safe, as
* STARTTLS is sent very early on in the registration phase, where the
* won't start its handshake until the client gets this line. Currently,
* we assume the write will not block here; this is usually safe, as
* STARTTLS is sent very early on in the registration phase, where the