This is an example for SMTP-TLS handshake on port 25 with ASSP 2.0: 

 # RFC 4954 

 S: 220 mail.imc.org SMTP service ready 
 C: EHLO mail.ietf.org 
 S: 250-mail.imc.org offers a warm hug of welcome 
 S: 250 STARTTLS or 250-STARTTLS 
 C: STARTTLS 
 S: 220 Go ahead 

 # this set's client and Server to transparent Proxy mode  
 # from here we do not care about what is done between this two peers 
 # even if the TLS negotation will fail - a SPAM comes never with TLS 

So, if the Client requests a STARTTLS and the Server is able to do
STARTTLS, the connection on port 25 will be moved in to a
transparent-Proxy-mode for the further encrypted communication.  
DropTLS will remove STARTTLS from this handshake (it is not sent to
the server) - this is only usefull, if the STARTTLS confuses the
server. This is done by the singlethread versions (1.x) any time -
because they do not have a transparent proxy! 


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