@THI_Staff Apologies for a late response on this. I haven't used this yet. I was grandfathered on some free monitoring elsewhere. That being said, some of the delivery reports tell you servers that attempted to send email on your behalf. That has helped me resolve some delivery issues where others were sending legitimate emails, but using one of our email addresses instead of theirs. That tripped a DMARC fail. I would start their service without and then see if you want more.