Cisco Cisco Email Security Appliance C160 Mode D'Emploi
4-3
Cisco IronPort AsyncOS 7.6 for Email Configuration Guide
OL-25136-01
Chapter 4 Understanding the Email Pipeline
Table 4-2
Email Pipeline for the Cisco IronPort Appliance: Routing and Delivery Features
Wo
rk
Q
u
e
u
e
LDAP Recipient Acceptance
LDAP validation for recipient acceptance
occurs within the work queue. If the recipient
is not found in the LDAP directory, the
message is dropped or bounced. LDAP
validation can be configured to occur within
the SMTP conversation instead.
occurs within the work queue. If the recipient
is not found in the LDAP directory, the
message is dropped or bounced. LDAP
validation can be configured to occur within
the SMTP conversation instead.
Masquerading
or LDAP Masquerading
Masquerading occurs in the work queue; it
rewrites the Envelope Sender, To:, From:,
and/or CC: headers, from a static table or via
an LDAP query.
rewrites the Envelope Sender, To:, From:,
and/or CC: headers, from a static table or via
an LDAP query.
LDAP Routing
LDAP queries are performed for message
routing or address rewriting. Group LDAP
queries work in conjunction with message
filter rules
routing or address rewriting. Group LDAP
queries work in conjunction with message
filter rules
mail-from-group
and
rcpt-to-group
.
Message Filters*
Message Filters are applied prior to message
“splintering.” * Can send messages to
quarantines.
“splintering.” * Can send messages to
quarantines.
Safelist/Blocklist Scanning
AsyncOS checks the sender address against
the end user safelist/blocklist database. If the
sender address is safelisted, anti-spam
scanning is skipped. The message may be
splintered if there are multiple recipients.
*Can send messages to quarantines if sender is
blocklisted.
the end user safelist/blocklist database. If the
sender address is safelisted, anti-spam
scanning is skipped. The message may be
splintered if there are multiple recipients.
*Can send messages to quarantines if sender is
blocklisted.
Anti-Spam**
E
m
ail Sec
u
rit
y
M
ana
ge
r Scan
nin
g
(Per
Re
cipi
ent
)
Anti-Spam scanning engine examines
messages and returns a verdict for further
processing.
messages and returns a verdict for further
processing.
Anti-Virus*
Anti-Virus scanning examines messages for
viruses. Messages are scanned and optionally
repaired, if possible. * Can send messages to
quarantines.
viruses. Messages are scanned and optionally
repaired, if possible. * Can send messages to
quarantines.
Content Filters*
Content Filters are applied. DKIM, SPF, and
SIDF verification is performed if appropriate
content filter conditions are defined. * Can
send messages to quarantines.
SIDF verification is performed if appropriate
content filter conditions are defined. * Can
send messages to quarantines.
Outbreak Filters*
The Outbreak Filters feature helps protect
against virus outbreaks, as well as new scam,
phishing and malware attacks. * Can send
messages to quarantines.
against virus outbreaks, as well as new scam,
phishing and malware attacks. * Can send
messages to quarantines.
Data Loss Prevention (Outgoing
Messages Only)
Messages Only)
RSA Email Data Loss prevention examines
outgoing messages for sensitive data. RSA
Email DLP is for outgoing messages only. *
Can send messages to quarantines.
outgoing messages for sensitive data. RSA
Email DLP is for outgoing messages only. *
Can send messages to quarantines.
Virtual gateways
Sends mail over particular IP interfaces or
groups of IP interfaces.
groups of IP interfaces.