An email fails to be created in Dynamics 365 with a NoRecipientMatch sync error

When reviewing email messages that were analyzed for automatic promotion by Dynamics 365, you see an email message that failed to be created in Dynamics 365 with a NoRecipientMatch sync error or error code -2147218683.

When Dynamics 365 evaluates an email in your mailbox, multiple conditions are evaluated to determine if the message should automatically be created as an email activity in Dynamics 365. If the evaluation results in a NoRecipientMatch error, this indicates one of the following conditions:

1. None of the email addresses on the To or Cc lines of the email are users or queues in Dynamics 365.
   • Example A: You received the email because it was sent to a distribution group and you are a member of that distribution group. Your email address stored in Dynamics 365 is not actually on the To or Cc lines of the email.
   • Example B: You have multiple email addresses (ex. paul@contoso.com and paul.cannon@contoso.com) for the same mailbox but the email addresses on the To or Cc line of the email does not match any of the email addresses stored in your user record in Dynamics 365.
2. There is a user or queue on the To or Cc line of the email but the following conditions exist:
   • The email address used by the User or Queue exists on other records in Dynamics 365. For example: A User has the email address paul@contoso.com but that email address also exists on one of the email address fields of another email enabled entity such as a user, queue, contact, lead, or account.
   •  Your organization is configured to leave email address values as unresolved if multiple matches are found. 
     
     The combination of the two conditions mentioned above would cause the email to not be resolved to a user or queue record.
3. The email address of the user or queue is on the Bcc of the email.
   
   Example: You received the email because your email address was on the Bcc line of the email. Unless your personal options in Dynamics 365 are configured to track "All email messages", the email will not be tracked.
   
   Unless the email address on the To or Cc line of the email matches the email address stored in Dynamics 365 or your personal options in Dynamics 365 are configured to track "All email messages", the email will not be tracked.
4. There is not a row in the EmailSearchBase table for the User or Queue mailbox that received the email.
   
   When looking for matching User or Queue records, Dynamics 365 queries a table called EmailSearchBase. This table should automatically have a row for the email address of every email enabled record including Users and Queues. On rare occassions this table may be missing a row which can then cause Dynamics 365 to not find a matching row when querying this table for Users or Queues that are on the email message. 
   
   You can open a web browser and use the Dynamice 365 Web API to verify if a row exists for the user or queue email address that received the email message. Use the following syntax:
   
   https://<Your Organization URL>/api/data/v9.1/emailsearches?$filter=emailaddress eq '<email address of user or queue>'
   
   Example: https://contoso.crm.dynamics.com/api/data/v9.1/emailsearches?$filter=emailaddress eq 'paul@contoso.com'
   
   If no record is returned, this would indicate a row does not exist for that email address in the EmailSearchBase table. 

Review the characteristics of the email and which option you have configured in your personal options for email tracking.

1. To verify the email address stored in Dynamics 365:

1. Navigate to Settings and then click Email Configuration.
2. Click Mailboxes.
3. Open your mailbox record and verify the email address on the To or Cc line of the email matches the email address found in your mailbox record.

NOTE: If you have multiple email addresses for your mailbox, you can click the Regarding lookup and add the other email address to one of the othe email address fields on your user record.

2. If the email address of the user or queue exists on multiple records (ex. another user, queue, lead, account, contact, etc...), either remove the email address from the other records or change the setting Set To, cc, bcc fields as unresolved values if multiple matches are found in Incoming Emails to No. You can find this setting by navigating to Settings, Email Configuration, and then clicking Email Configuration Settings. Within the Set Email form options section, locate the setting named "Set To, cc, bcc fields as unresolved values if multiple matches are found in Incoming Emails."

3. To view or change your email tracking setting:

1. Access your personal options in Dynamics 365 by clicking settings (gear icon in upper-right corner) and then clicking Options.
2. Click the Email tab.
3. Under the Select the email messages to track in Microsoft Dynamics 365 section, locate the Track setting.
4. Adjust the option as necessary to control which emails should be tracked in Dynamics 365 automatically.

For example: If you want every email you receive, regardless of the sender, to automatically be created as an email activity in Dynamics 365, select the option "All email messages".

For more information about email correlation, see Email message filtering and correlation

4. If no records are found when using the steps in Cause # 4, follow these steps:

1. Open the User or Queue record in Dynamics 365.
2. Change the email address value to something else and click Save.
3. Then change the email address value back to the correct value and click Save. This will normally recreate the missing row.