Set the read timeout.
The default SMTP port number, 25.
true if server advertises STARTTLS. You cannot get valid value before opening SMTP session.
true if this object uses STARTTLS.
Enables SMTP/TLS (STARTTLS) for this object. context is a OpenSSL::SSL::SSLContext object.
Disables SMTP/TLS (STARTTLS) for this object. Must be called before the connection is established to have any effect.
Set the number of seconds to wait until timing-out a read(2) call.