I've been trying to send an email over REST using /_api/SP.Utilities.Utility.SendEmai, but seems like the emails just never arrive.

Current setup

  • SharePoint Online
  • I send emails to myself and to other internal mailboxes within office 365 tenant
  • When I type a nonexistent email the script fails with an error. And if I use the correct one it is sent successfully, but it just never arrives
  • I tried several ways to send emails with and without AdditionalHeaders, but nothing seems to work

Can someone help me, please, to figure out what I could be doing wrong?

This is the code I've been using:

var subject = "SUBJECT OF THE MAIL";
var mailContent = "Some Heading for the mail Content Content";
var toList = ["correctUser@domain.com"]

//Send email message over REST
function sendMail(toList, subject, mailContent) {
    var restUrl = _spPageContextInfo.webAbsoluteUrl +     "/_api/SP.Utilities.Utility.SendEmail",
restHeaders = {
    "Accept": "application/json;odata=verbose",
    "X-RequestDigest": $("#__REQUESTDIGEST").val(),
    "Content-Type": "application/json;odata=verbose"
mailObject = {
    'properties': {
        '__metadata': {
            'type': 'SP.Utilities.EmailProperties'
        'To': {
            'results': toList
        'Subject': subject,
        'Body': mailContent,
                   { "type": "Collection(SP.KeyValue)" },
                        "__metadata": {
                            "type": 'SP.KeyValue'
                        "Key": "content-type",
                        "Value": 'text/html',
                        "ValueType": "Edm.String"

return $.ajax({
    contentType: "application/json",
    url: restUrl,
    type: "POST",
    data: JSON.stringify(mailObject),
    headers: restHeaders


    sendMail(toList, subject, mailContent).then(function(data)    {console.log(data.d)})

Turns out, the account I was using when sending these messages did not have Exchange Online license assigned. So, essentially, I need to have a mailbox to send emails via SendEmail service.

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