Hi, @Will ,
For now, it is not customizable for a sharing email in SharePoint Online. Here's a post in UserVoice, you can vote for it so the MS develop team will consider it as a possible new feature in the future. .
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Hi there,
Is it possible to customize mail content template, when we share a document to someone else?
Hi, @Will ,
For now, it is not customizable for a sharing email in SharePoint Online. Here's a post in UserVoice, you can vote for it so the MS develop team will consider it as a possible new feature in the future. .
Unfortunately it isn't possible to customize this template for text or layout.