Canon Color Universal Send Kit-Q1, Руководство по обслуживанию

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Chapter 2
2-5
2.1.4 Encrypted reception
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There are two types of encrypted reception methods available - encrypted POP and SMTP email receptions.
Encrypted POP Reception
When Allow SSL (POP) control is turned on in Authentication/Encryption Settings window* and the POP server supports STLS command, defined in POP3 pro-
tocol, the imageRUNNER/iR can communicate with encrypted packets using SSL (TLS). The communications slows down since not only the user name and pass-
word but also the entire communication data for email reception are encrypted. If Allow SSL (POP) control is turned on but the POP server does not support STLS
command of POP3 protocol, it results in an error. If an error occurs in POP SSL communications, the status line displays "SSL Error (POP) ."
* Authentication/Encryption Settings window: opens by selecting Additional Functions > System Settings > Network Settings > Email/I-Fax > Authent./ Encryp-
tion.
STLS
An extended SMTP command, defined in RFC 2487. RFC 2449 -- POP3 Extension Mechanism -- specifies that STLS must support CAPA command. If a server
supports STLS, it states the support in response to CAPA command.
The following lines exemplify communications when STLS is enabled.
...
S: +OK POP3 v2001.78 server ready <4a61.3e55cd70@test.canon.co.jp>
C: CAPA
S: +OK Capability list follows:
S: TOP
S: LOGIN-DELAY 180
S: UIDL
S: STLS :<-- Indicates the server supports STLS.
S: USER
S: SASL CRAM-MD5 LOGIN
S: .
C: STLS
S: +OK Begin TLS negotiation
<TLS negotiation, further commands are under TLS layer>
S: +OK POP3 v2001.78 server ready 4a61.3e55cd70@test.canon.co.jp
Encrypted SMTP Reception
The iR 2270 and later models support SSL (TLS) encryption for receiving email messages from SMTP servers. To use this feature, a valid server certificate is
required. When SSL or On option is selected for Allow SSL (SMTP Receive)* and the email server supports STARTTLS command, the imageRUNNER/iR can
communicate with encrypted packets using SSL (TLS). When Off option is selected for Allow SSL (SMTP Receive) control, the imageRUNNER/iR does not in-
clude STARTTLS in a response for EHLO. The communications slows down since not only the user name and password but also the entire data for email sending
are encrypted. When Off option is selected for Allow SSL (SMTP Receive) or the email server does not support STARTTLS command of SMTP protocol, the
communication packets are not encrypted.
*Allow SSL (SMTP Receive) control: is displayed by selecting Additional Functions > System Settings > Network Settings > Email/I-Fax > Authent./ Encryption.
STARTTLS Command
An extended SMTP command that notifies a start of encrypted communications in SSL/TLS to the SMTP server, defined in RFC 2487.
The following lines exemplify communications when STLS is enabled.
...
S: 220 mail.imc.org SMTP service ready
C: EHLO mail.example.com
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 imageRUN-
NER/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 START-
TLS. 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.
2.1.5 MAC Address Block Function
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Receiving MAC Address Settings
Limits network packets to receive by MAC address. To enable this function, select Additional Functions > System Settings > Network Settings > Email/I-Fax >