Canon imageRunner iR2270 Service Manual page 35

Chapter 2
S: 250-mail.imc.org offers a warm hug of welcome
S: 250-STARTTLS :<-- Indicates the server supports STARTTLS.
S: 250 DSN
C: STARTTLS : <--Declares the use of SSL/TLS.
S: 220 Go ahead
C: <starts TLS negotiation>
C & S: <negotiate a TLS session>
C & S: <check result of negotiation>
-- The communication packets are encrypted from now on --
C: EHLO mail.example.com
S: 250-mail.imc.org touches your hand gently for a moment
S: 250 DSN
C: MAIL FROM <ifax@mail.example.com>
S: 250 Sender OK
...
The client is notified with the response of EHLO that the server supports STARTTLS.
When the client issues STARTTLS command, the server and client perform TLS
negotiation and resume communications from the beginning with encrypted packet data.
If SSL option is selected for Allow SSL (SMTP Receive) control and the client carry on
communicating in plain text, without using STARTTLS, the imageRUNNER/iR replies
"530 Must issue a STARTTLS command first" of SMTP mail command and terminates the
SMTP connection with the error. The user interface indicates "SSL Error (SMTP RX
Reject)" in the status line.
If On option is selected for Allow SSL (SMTP Receive) control, the imageRUNNER/iR
accepts communications with the client in plain text, without using STARTTLS. If an SSL
processing results in an error, for example the imageRUNNER/iR does not feature an
encryption algorithm common to the client, the user interface indicates "SSL Error (SMTP
Receive)" and terminates the SMTP connection with the error.
Allow SSL (SMTP Receive) control defaults to Off.
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