Encrypted Transmission - Canon DU7-1178-000 Service Manual

Chapter 2
4) Press the settings button that has been made active.
5) Programme the transmission mail server window's logon information. In the default, 'use same settings
as my incoming server' is selected. This setting uses the POP3 authentication account name and password
entered against the reception mail server in the previous window and performs SMTP AUTH operation.
F-2-2
If 'Log on using' is selected, the account and password to be used with SMTP AUTH can be specified in-
dividually. In that case, if 'Log on using Secue Password Authentication' is selected, encoding is carried
out by TSL(SSL), using the STARTTTLS command.
<SMTP AUTH related user error codes>
The related new user error codes are #839 and #843. For details, refer to the section on Troubleshooting.

2.1.2 Encrypted transmission

0010-7593
Transmission packet encryption (SSL)
When Additional Functions > System Settings > Network Settings > E-Mail/ I-Fax > Authnt. /Encryption
> allow SSL(SMTP send) is set to ON, and the mail server supports the SMTP protocol's STARTTLS
command, SSL (TLS) is used for transmission packet encryption. Not only the user name and password
are encrypted, but also all of the mail transmission data. Therefore, the transmission speed is slower.
If 'allow SSL(SMTP Semd)' is set to OFF, or the mail server does not support the SMTP protocol's
STARTTLS command, the transmission packet is not encrypted.
<STARTTLS command>
STARTTLS is an SMTP command that tells the server that encrypted transmission (SSL/ TLS) is about
to start. The command is standardized in RFC2487. Following is an example of the protocol flow during
STARTTLS.
The EHLO response from the client declares that STARTTLS is supported from the server. When the cli-
ent generates the STARTTLS command, the operation is reprocessed from the starts and negotiation is
initiated and the packet data are encrypted.
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: 250-8BITMIME
S: 250-STARTTLS : <- Shows that the server supports STARTTLS.
S: 250 DSN
C: STARTTLS : <- Declares to server that SSL/TLS are to be performed.
S: 220 Go ahead
-- All subsequent transmission packets will be encrypted.
C: <starts TLS negotiation>
C&S: <negotiate a TLS session>
C&S: <check result of negotiation>
C: EHLO mail.example.com
S: 250-mail.imc.org touches your hand gently for a moment
S: 250-8BITMIME
S: 250 DSN
<User error>
Related new user errors are #841 and #842. For details, refer to the section on Troubleshooting.
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