Update remediate-malicious-email-delivered-office-365.md

minor change to line 34 for clarity/sentence structure

Author: Yebbenbe

defender-office-365/remediate-malicious-email-delivered-office-365.md

@@ -31,7 +31,7 @@ Remediation means to take a prescribed action against a threat. Malicious email
   - **Organization limits**: The maximum number of active, concurrent email remediations is 50. Once the limit is reached, no new remediations are triggered until some actions are completed.
   - **Email message limits**: If an active remediation involves more than one million email messages, no new email remediations are allowed.
   - **Recipient requirements in remediations**:
-    - The total percentage of selected recipients must be at least 40% of the total email message count in the remediation. For instance, if an email is sent to five recipients, Explorer (Threat Explorer) counts it as five email messages. If the remediation requires the deletion of 5,000 email messages, the remediation must target at least 2,000 recipients.
+    - The total percentage of selected recipients must be at least 40% of the total email message count in the remediation. If the remediation requires the deletion of 5,000 email messages, the remediation must target at least 2,000 recipients. Note that Explorer (Threat Explorer) counts each recipient of a message as a unique email (a message sent to 5 addresses counts as 5 messages).
     - If the recipient count is less than 40% of the total email message count, the remediation can't be used to delete more than 1,000 messages that were sent to a single recipient.
 
 - You need to be assigned permissions before you can do the procedures in this article. Admins can take the required action on email messages, but the **Search and Purge** role is required to get those actions approved. To assign the **Search and Purge** role, you have the following options: