On occasion spam filters do block the emails sent from Intervals. Checking a spam filter is definitely the best place to start. If that does not turn out to be the culprit, all emails from Intervals are sent from email@example.com on behalf of the user. If your organization utilizes SPF (Sender Policy Framework) adding mx.myintervals.com to the record should alleviate the problem. For example:
Modify this record:
"v=spf1 a mx ~all"
To include mx.myintervals.com:
"v=spf1 a mx a:mx.myintervals.com ~all"
If you do not use SPF approving firstname.lastname@example.org as an authorized sender and/or whitelisting all email from mx.myintervals.com | 18.104.22.168 may do the trick as well. If you have any questions or need our system administration team to review the email logs to see if we can isolate the problem, please contact our support team here.