Replying directly to a secure email being sent out by HES using an Encryption Policy will trigger client's/HES User's High Risk Attachment Policy.
Disabling the .htm file type on the high risk attachment policy itself will not be a work around as it will become a vulnerability.
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To make any reply to an encrypted email pass through HES:
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Go to Inbound Protection > Policy Objects > Keyword Expressions then click Add.
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The Add Keyword Expression Category window will appear.
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Provide a List name, click Add then Save. In this example, we will use “Secure Reply Bypass”.
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The Add Keyword Expression window will appear.
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In the Add Keyword Expression text box, type the expression “\bzdproxy@privatepost.com\b” then click Save.
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Create a policy for the policy object that was created.
Go to Inbound Protection > Policy then click Add.
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The Edit Rule page will appear.
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On the Basic Information tab:
- Status - tick Enable.
- Name - Enter a Name. In this example the name given is Secure reply Bypass.
- Note - Type any information about the policy. For example: Bypass rule for replying to an encrypted email.
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On the Recipients and Senders tab:
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Under the Recipients section, type the domain name then click Add to move the new domain to the “Selected” list.
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Under the Senders section - tick the Anyone radio button.
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Next, go to Scanning Criteria > Advanced:
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Tick Specified header matches checkbox then click on keyword expressions on the right side.
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The Header Keyword Expressions window will appear.
- On the Header Keyword Expressions window:
- Under Specified header matches select Other, then on the blank field next to it, type "Sender".
- Locate the new policy object from the Available list (In this example, Sender), then click Add to move it on the "Selected" list. Click Save.
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Go to the Actions tab. Under the Intercept section, select Deliver now then click Submit.
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To review the policy, go back to Basic Information tab. The policy should look like this:
Recipients and Senders
If message is
Incoming
to *@sbnabu1.mailsecuritylab.com
AND
from AnyoneScanning Criteria
And message attributes match
Specified Header matches...Actions
Then action is
Deliver now
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