Canon imageRunner iR2270 Service Manual page 34

Chapter 2
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 include 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
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