Inserting Signature with the OnMessageSend event duplicates the signature

[barisbikmaz]

Provide required information needed to triage your issue

When updating the signature in the mail body after the "OnMessageSend" event, the updated signature is inserted below the existing signature.

Your Environment

• Platform : Mac
• Host : Outlook
• Office version number: Word for Mac 16.87 (24071426)
• Operating System: macOS Monterey (12.7.4)

Expected behavior

When the OnMessageSend event is fired we are updating the signature in the mail body. We expect that Office.context.mailbox.item.body.setSignatureAsync replaces the existing signature.

Current behavior

If the mail already has already signature, setSignatureAsync inserts a new signature below the existing signature.

Steps to reproduce

1. Create an Outlook manifest with OnMessageSend and OnNewMessageCompose events enabled
2. Each time one of the events are called use the setSignatureAsync API to insert a signature
3. Observe that the signature inserted by the OnMessageSend event is below the existing signature

Provide additional details

• Does not happen on Windows or Office for Web
  • Example code to run when the event happens

    Office.context.mailbox.item.body.setSignatureAsync(
    "<p>Greetings<p><p><b>John Doe</b></p>",
    { coercionType: "html" },
    );

Context

We have an addin that inserts the signature at the "OnMessageSend" event to ensure that the organisational CI/CD guidelines are adhered to even if a user changes the signature manually. Currently we can only ensure this in Windows or Web environments.

Useful logs

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[anjalitp]

Thanks for reporting this issue regarding Signature API. It has been put on our backlog. We unfortunately have no timelines to share at this point

Internal tracking Id: 4820115