In what order Ironport checks incoming mails / outgoing

Hi guys,.

I can't find any document about this one. In what order does Ironport checks / analyze / check incoming emails?

Considoring Ironport has these controls enabled on a mail policy;

1 anti-Spam

2 anti-virus

3 HAT and RAT

4 Senderbase reputation score

5 outbreak of filters

6. content filters

7 SPF

and

8 anti Maleware protection and file analysis.

Why would I ask you this because someone asked me why the emails were blocked by anti-spam instead of SPF. And is it possible to block incoming emails spoofed by "own domain name but different IP address" from the outside by SPF instead of other policies? Or is it because the Ironport shall follow the order?

Is there one better way other than creating a new policy - content SPF above default to achieve policy filters? Because I'm afraid if I create a new policy specifically for SPF above default policy and when a mail to has an SPF record checked but a virus then default policy does not have a second control and the e-mail will be sent. Am I wrong?

Thank you all in advance

Hello

The pipeline of e-mail flow is explained in detail in the final user's guide Chapter 4

http://www.Cisco.com/c/dam/en/us/TD/docs/security/ESA/esa9-7/ESA_9-7_Use...

In short the email circulation in the appliance as below

.
Email-> SBR-> HAT-> SPF/DKIM / DMARC-> RAT->-> anti - Spam-anti-virus-> WAP-> content-> outbreak Filters > filters, Message filters

Please check SPF note is performed early in the pipeline, but a decision will be made only based on message/content filters created for the SPF verdict.

An email would be analyzed by all engines except where a final decision (such as bounce, drop) is encountered. Put in quarantine is not a final act and an email would be sent only to quarantine at the end of the line of treatment after that scanning everything is finished. This is why an email with the action of the SPF filter quarantine could again until the end of the spam quarantine based on anti-spam verdict.

You will need to determine what analysis you want to perform and to be bypassed for those emails and make changes accordingly.

Thank you
Libin venet

Tags: Cisco Security

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