Cisco Cisco Email Security Appliance C680 用户指南
Chapter 15 System Administration
15-26
Cisco IronPort AsyncOS 7.5 for Email Configuration Guide
OL-25136-01
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:
means that alert 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.
every 30 minutes, so 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.
for viruses or spam. 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.
affected by bounce profiles or destination control limits.