Cisco Cisco Email Security Appliance C170 Guia Do Utilizador
15-18
Cisco IronPort AsyncOS 7.6 for Email Configuration Guide
OL-25136-01
Chapter 15 System Administration
Alert Subject
An alert email message's subject follows this format:
Subject: [severity]-[hostname]: ([class]) short message
Alert Delivery
Because alert messages can be used to inform you of problems within your Cisco IronPort appliance,
they are not sent using AsyncOS’s normal mail delivery system. Instead, alert messages pass through a
separate and parallel email system designed to operate even in the face of significant system failure in
AsyncOS.
they are not sent using AsyncOS’s normal mail delivery system. Instead, alert messages pass through a
separate and parallel email system designed to operate even in the face of significant system failure in
AsyncOS.
The alert mail system does not share the same configuration as AsyncOS, which means that alert
messages may behave slightly differently from other mail delivery:
messages may behave slightly differently from other mail delivery:
•
Alert messages are delivered using standard DNS MX and A record lookups.
–
They do not use
smtproutes
in AsyncOS versions older then 5.X.
–
They do cache the DNS entries for 30 minutes and the cache is refreshed every 30 minutes, so
in case of DNS failure the alerts still go out.
in case of DNS failure the alerts still go out.
•
Alert messages do not pass through the work queue, so they are not scanned for viruses or spam.
They are also not subjected to message filters or content filters.
They are also not subjected to message filters or content filters.
•
Alert messages do not pass through the delivery queue, so they are not affected by bounce profiles
or destination control limits.
or destination control limits.