How to create Office365 signatures that are supported by Nylas

Use the steps below to create a Nylas-supported signature in Office365. This must be added by the email administrator. However, the email administrator can specify senders as well as variables such as names.


  1. Log on to the Exchange Admin Center (ECP).
  2. Select Mail Flow from the Navigation Pane on the left. When using Microsoft 365, this direct link also works.
  3. Click the + icon to create a new rule in the Rules section. If a menu opens up, select Apply disclaimers…  If this doesn't apply, continue to the next step.
  4. Enter a name for your rule, for example, Corporate External Signature and Disclaimer.
  5. Click the More options… link to show all rule conditions and actions. This allows for adding more conditions.
  6. Select the Apply this rule if… condition. Click Add condition to add the second condition.
    1. The sender… -> Is external/internal -> Inside the organization
    2. The recipient… -> Is external/internal -> Outside the organization
  7. From the Do the following… list, use the selection below.
    1. Apply a disclaimer to the message… -> Append a disclaimer
  8. Click the Enter text… link to construct your Signature.
    1. You can use HTML, inline CSS and links to images stored on a web server by using the img tag.
    2. You can also use Active Directory user properties as a variable. Place this value using this formatting with the double percent character, such as %%DisplayName%%.
    3. The signature, including all HTML tags, can be up 5,000 characters long.
    4. Any HTML tags are automatically stripped when the message format is Plain Text.
  9. Click the Select one… link to select a fallback option when the disclaimer can’t be added. Select from the following options.
    1. Wrap | Enclose the original message in a new message envelope and add the disclaimer into the new message.
    2. Reject | Don’t deliver the message and send an NDR to the sender.
    3. Ignore | Deliver the message but without the disclaimer.
  10. Optionally, set any exceptions, auditing, or other options for the rule.
  11. Click Save to create and activate the Transport Rule.


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