300-720: Securing Email with Cisco Email Security Appliance

Disabling the Local Spam Quarantine to Activate the External Quarantine If you were using a local spam quarantine before enabling an external spam quarantine, you must disable the local quarantine in order to send messages to the external quarantine.

https://www.cisco.com/c/en/us/td/docs/security/esa/esa11-1/user_guide/b_ESA_Admin_Guide_11_1/b_ESA_Admin_Guide_chapter_0101010.html?bookSearch=true#con_1172419

The envelope sender and the envelope recipeint have a higher priority over the sender header when you match a message to a mail policy. If you configure a mail policy to match a specific user, the messages are automatically classified into the mail policy based on the envelope sender and the envelope recipient. https://www.cisco.com/c/en/us/td/docs/security/esa/esa11-1/user_guide/b_ESA_Admin_Guide_11_1/b_ESA_Admin_Guide_chapter_01001.html

Reference: https://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/118136-qanda-esa-00.html

You can use the SMTP route feature on Cisco ESA to specify how messages for a specific domain are routed to their destination. You can modify the SMTP route for the domain abc.com and change the IP address to 192.168.1.10 to ensure that messages are delivered correctly3. Reference = Securing Email with Cisco Email Security Appliance (SESA) v3.1

Spam Quarantine Alias Consolidation Query is a type of query that must be configured when setting up the Spam Quarantine while merging notifications on Cisco ESA. This query allows Cisco ESA to consolidate multiple email addresses that belong to the same end user into one entry in the Spam

Quarantine, and send only one notification email to that end user with all the quarantined messages for all their email addresses.

Reference: User Guide for AsyncOS 15.0 for Cisco Secure Email Gateway, page 10-10.

The appliance enforces your organization's policies for messages sent to and from your users through the use of mail policies. These are sets of rules that specify the types of suspect, sensitive, or malicious content that your organization may not want entering or leaving your network. This content may include:

-spam

-legitimate marketing messages

-graymail

-viruses

-phishing and other targeted mail attacks

-confidential corporate data

-personally identifiable information

https://www.cisco.com/c/en/us/td/docs/security/esa/esa11-1/user_guide/b_ESA_Admin_Guide_11_1/b_ESA_Admin_Guide_chapter_01001.html?bookSearch=true

Condition is a component that must be added to the content filter to trigger on failed SPF Verification or DKIM Authentication verdicts. Condition is a criterion that determines whether a message matches a content filter rule or not, such as message size, sender address, attachment type, etc.

To add a condition to the content filter that triggers on failed SPF Verification or DKIM Authentication verdicts, the administrator can follow these steps:

Select Mail Policies > Content Filters and click Add Filter.

Enter a name and description for the content filter.

Under Conditions, click Add Condition.

Choose SPF Verification or DKIM Authentication from the drop-down menu.

Choose Fail from the drop-down menu.

Click Submit.

The other options are not valid components to trigger on failed SPF Verification or DKIM Authentication verdicts, because they are not part of content filters.

Reference: [User Guide for AsyncOS 15.0 for Cisco Secure Email Gateway], page 8-3 and page 8-4.