In ItemSend Event handler, I want to change the email content. Send back the modified content to the user for confirmation. function validateBody(event) {
mailboxItem.body.getAsync(
"html",
...
I'm trying to tackle the same use case as well. While I'm stuck with another issue in the event handler, just wondering if you had tried:
Office.context.mailbox.item.body.setAsyncwithin your if(checkBody) code?