I have added a client people picker on a page and would like to send mail to all the members of the selected SharePoint group in Javascript. Using Sharepoint Online.

The people picker is configured for single user or single group

function initializePeoplePicker(peoplePickerElementId) {
        // Create a schema to store picker properties, and set the properties.
        var schema = {};
        schema['PrincipalAccountType'] = 'User,SPGroup';
        //This value specifies where you would want to search for the valid values
        schema['SearchPrincipalSource'] = 15;
        //This value specifies where you would want to resolve for the valid values
        schema['ResolvePrincipalSource'] = 15;
        schema['AllowMultipleValues'] = false;
        schema['MaximumEntitySuggestions'] = 10;
        //schema['Width'] = '300px';
        this.SPClientPeoplePicker_InitStandaloneControlWrapper(peoplePickerElementId, null, schema);

Send Email Function on click of send email button:

function sendEmail() {
        var dashboard = _spPageContextInfo.siteAbsoluteUrl;
        var from = 'no-reply@sharepointonline.com'
        var to = taskAssignUserEmail;            
        var subject = taskName + " Re-Assigned";
        var body = taskName + " task has been assigned to you.<br/><br/>Please click <a href='" + dashboard + "'>here </a> to go to your dashboard and act upon the task.";
        var siteurl = _spPageContextInfo.webServerRelativeUrl;
        var urlTemplate = siteurl + "/_api/SP.Utilities.Utility.SendEmail";
            contentType: 'application/json',
            url: urlTemplate,
            type: "POST",
            data: JSON.stringify({
                'properties': {
                    '__metadata': {
                        'type': 'SP.Utilities.EmailProperties'
                    'From': from,
                    'To': {
                        'results': [to]
                    'Body': body,
                    'Subject': subject
            headers: {
                "Accept": "application/json;odata=verbose",
                "content-type": "application/json;odata=verbose",
                "X-RequestDigest": jQuery("#__REQUESTDIGEST").val()
            success: function (data) {
                //alert('Email Sent Successfully');
                alert('Task re-assigned to ' + taskAssignUser);

            error: function (err) {
                console.warn('Error in sending Email: ' + JSON.stringify(err));

What do I keep in To field in above function?


I was able to achieve it by just giving the display name in the taskAssignUserEmail variable for sending the mail.

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