On Send

var mailboxItem; 

Office.initialize = function (reason) { 
    mailboxItem = Office.context.mailbox.item; } 

// <param name="event">ItemSend event is automatically passed by on-send code to the function specified in the manifest.</param> function validateBody(event) { 
    mailboxItem.body.getAsync("html", { asyncContext: event }, checkBodyOnlyOnSendCallBack); } 

// Determine whether the body contains a specific set of blocked words. If it contains the blocked words, block email from being sent. Otherwise allow sending. 
// <param name="asyncResult">ItemSend event passed from the calling function.</param> function checkBodyOnlyOnSendCallBack(asyncResult) { 
    var listOfBlockedWords = new Array("blockedword", "blockedword1", "blockedword2"); 
    var wordExpression = listOfBlockedWords.join('|');  

    // \b to perform a "whole words only" search using a regular expression in the form of \bword\b. 
    // i to perform case-insensitive search. 
    var regexCheck = new RegExp('\\b(' + wordExpression + ')\\b', 'i');  
    var checkBody = regexCheck.test(asyncResult.value); 

    if (checkBody) { 
        mailboxItem.notificationMessages.addAsync('NoSend', { type: 'errorMessage', message: 'Blocked words have been found in the body of this email. Please remove them.' }); 
        // Block send. 
        asyncResult.asyncContext.completed({ allowEvent: false }); 
    } 

    // Allow send. 
    asyncResult.asyncContext.completed({ allowEvent: true }); } 

// Invoke by Contoso Subject and CC Checker add-in before send is allowed. 
// <param name="event">ItemSend event is automatically passed by on-send code to the function specified in the manifest.</param> function validateSubjectAndCC(event) { 
    shouldChangeSubjectOnSend(event); 
} 

// Determine whether the subject should be changed. If it is already changed, allow send. Otherwise change it. 
// <param name="event">ItemSend event passed from the calling function.</param> function shouldChangeSubjectOnSend(event) { 
    mailboxItem.subject.getAsync( 
        { asyncContext: event }, 
        function (asyncResult) { 
            addCCOnSend(asyncResult.asyncContext); 
            //console.log(asyncResult.value); 
            // Match string. 
            var checkSubject = (new RegExp(/\[Checked\]/)).test(asyncResult.value) 
            // Add [Checked]: to subject line. 
            subject = '[Checked]: ' + asyncResult.value; 

            // Determine whether a string is blank, null, or undefined. 
            // If yes, block send and display information bar to notify sender to add a subject. 
            if (asyncResult.value === null || (/^\s*$/).test(asyncResult.value)) { 
                mailboxItem.notificationMessages.addAsync('NoSend', { type: 'errorMessage', message: 'Please enter a subject for this email.' }); 
                asyncResult.asyncContext.completed({ allowEvent: false }); 
            } 
            else { 
                // If can't find a [Checked]: string match in subject, call subjectOnSendChange function.  
                if (!checkSubject) { 
                    subjectOnSendChange(subject, asyncResult.asyncContext); 
                    //console.log(checkSubject); 
                } 
                else { 
                    // Allow send. 
                    asyncResult.asyncContext.completed({ allowEvent: true }); 
                } 
            } 
        }); 
} 

// Add a CC to the email. In this example, CC contoso@contoso.onmicrosoft.com // <param name="event">ItemSend event passed from calling function</param> function addCCOnSend(event) { 
    mailboxItem.cc.setAsync(['Contoso@contoso.onmicrosoft.com'], { asyncContext: event }); }  

// Determine whether the subject should be changed. If it is already changed, allow send, otherwise change it. 
// <param name="subject">Subject to set.</param> // <param name="event">ItemSend event passed from the calling function.</param> function subjectOnSendChange(subject, event) { 
    mailboxItem.subject.setAsync( 
        subject, 
        { asyncContext: event }, 
        function (asyncResult) { 
            if (asyncResult.status == Office.AsyncResultStatus.Failed) { 
                mailboxItem.notificationMessages.addAsync('NoSend', { type: 'errorMessage', message: 'Unable to set the subject.' }); 

                // Block send. 
                asyncResult.asyncContext.completed({ allowEvent: false }); 
            } 
            else { 
                // Allow send. 
                asyncResult.asyncContext.completed({ allowEvent: true }); 
            } 
        }); 
}