Knowledgebase
How to troubleshoot issues when URL Defense is not working

Situation

URL Defense will defend against malicious and potentially harmful URL’s contained within emails.

  • URL Defense is not re-writing emails with DKIM signature.
  • You noticed that URL Defense is not re-writing links for some emails.
Solution

URL defense feature has some exception that can be configure according to customer needs. Make sure after you enable Attachment Defense which exceptions you want to add into customers.

  1. URL Defense and DKIM signature.
  2. URL Defense Exceptions.

URL Defense and DKIM signature

By default URL Defense will not re-write URLs that are located in DKIM signed emails. You need to enable this feature for users that use DKIM signature and will use URL Defense.

  1. Login with your admin credentials into Proofpoint Dashboard.
  2. Click on Company Settings tab.
  3. Under Company Settings, click on URL Defense tab.
  4. Check the box: Re-write URLs that are located in DKIM signed messages.

URL Defense Exceptions

URL Defense can be configured so that it doesn't have to re-write all links in emails. 

  1. Re-write URLs that are not located in an anchor tag
    1. This will re-write URL’s that are not included in an anchor tag:
      • Example not included in <a href="proofpoint.com”></a>
  2. Exclude URLs that contain specified domains/IP addresses:
    1. URL’s will not be re-written that contain the specified Domains listed/IP address’s
      • Enter your domain list separated by line, comma or semi-colon
  3. Exclude active domains associated with this organization:
    1. This will exclude re-writing URL’s from emails from domains associated with the organisation being applied to
      • Check the box to enable this option
  4. Exclude re-writing emails that are sent by specified senders:
    1. This will not re-write URL’s that have specified senders/domains listed
      • Enter your domain list separated by line, comma or semi-colon
  5. Exclude re-writing bare IP addresses in plain text emails:
    1. This will not re-write bare IP address’s in plain text emails
      • Check the box to enable this option
  6. Exclude re-writing URLs in plain text emails:
    1. This will not re-write URLs contained in plain text emails
      • Check the box to enable this option
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