Руководство Пользователя для Cisco Cisco Email Security Appliance C190

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.

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.

LDAP queries are performed for message routing or 
address rewriting. Group LDAP queries work in 
conjunction with message filter rules 
mail-from-group

 and rcpt-to-group.

Message Filters are applied prior to message 
“splintering.” * Can send messages to quarantines.

 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.

Anti-Spam scanning engine examines messages 
and returns a verdict for further processing.

Anti-Virus scanning examines messages for 
viruses. Messages are scanned and optionally 
repaired, if possible. * Can send messages to 
quarantines.

Content Filters are applied. DKIM, SPF, and SIDF 
verification is performed if appropriate content 
filter conditions are defined. * Can send messages 
to quarantines.

The Virus Outbreak Filters feature helps protect 
against virus outbreaks. * Can send messages to 
quarantines.

Sends mail over particular IP interfaces or groups 
of IP interfaces.