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Direct access via web browser requires authentication is the restriction that is in place for end users accessing the spam quarantine on Cisco Secure Email Gateway appliances. Spam quarantine is a feature that allows Cisco ESA to store messages that are suspected to be spam and allow end users or administrators to review them and release or delete them as needed.

End users can access their personal spam quarantine on Cisco ESA either by clicking on a link in a notification email or by entering their email address and password in a web browser. In both cases, authentication is required to ensure security and privacy.

The other options are not valid restrictions that are in place for end users accessing the spam quarantine on Cisco Secure Email Gateway appliances, because they are either not mandatory or not related to authentication.

All users with administrator privileges can change spam quarantine settings and view and manage messages in the spam quarantine. You do not need to configure spam quarantine access for administrator users.

If you configure access to the spam quarantine for users with the following roles, they can view, release, and delete messages in the spam quarantine:

-Operator

-Read-only operator

-Help desk user

-Guest

-Custom user roles that have spam quarantine privileges

These users cannot access spam quarantine settings.

https://www.cisco.com/c/en/us/td/docs/security/esa/esa14-0/user_guide/b_ESA_Admin_Guide_14-0/b_ESA_Admin_Guide_12_1_chapter_0100000.html?bookSearch=true#con_1624156

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

If the McAfee antivirus scanning is enabled on the Cisco Secure Email Gateway and the virus scanning action is set to ''scan for viruses only'', then no repair is attempted, and the attachment is either dropped or delivered based on the antivirus policy settings. The administrator can choose to drop or deliver the infected attachment by selecting the appropriate action in the antivirus policy.Reference: [Cisco Secure Email Gateway Administrator Guide - Configuring McAfee Antivirus Scanning]

A regular expression is a sequence of characters that defines a search pattern for text. To match a string of 123ABCDEFGHJ, you need to use the following regular expression: \d{3}[A-Z]{9}. This expression means that the string must start with three digits (\d{3}), followed by nine uppercase letters ([A-Z]{9}). This expression will match any string that has the same format as 123ABCDEFGHJ. Reference =User Guide for AsyncOS 12.0 for Cisco Email Security Appliances - GD (General Deployment) - Regular Expressions [Cisco Secure Email Gateway] - Cisco