dmarctester.com

Gmail Accounts Not Receiving (Particularly CCed) Emails from Our Domain Despite DMARC Auth Positive Results Hello **Preface:** I do system admin for a small business, but it's only one part of my job. I am more computer literate than the average person, but it is not my focus. I have enough knowledge to set up email servers and do all the DNS records etc etc but troubleshooting, especially this current problem, is shaping up to be a bit outside my knowledge base. I say this so you know the extent of my knowledge. **The Pieces** * Our domain uses outlook and wix * I tested with every free testing option on the internet. You list it, I used it. * After troubleshooting, we pass auth for all of DNS, DMARC, SPF, DKIM. * DKIM alignment knowingly off * SPF alignment is good * Have occasionally gotten the result "Reverse DNS does not match SMTP Banner." **The Problem** Lately, we have had reports from contractors and clients with gmail addresses that they are not receiving our emails. It started with just CCed emails and then spread to about 1/3 of emails in general. I have only received an undeliverable message for one of these, and it stated it was bounced back due to excess activity. Since then, at least a dozen emails have just not been delivered, leaving no trace but their ghost in my "sent" folder. They aren't in the receiver's spam, they're not anywhere. Initially, I wasn't able to recreate this problem, but as it's strangely grown more severe, I can now recreate the issue specifically with CCed emails. No CCed email I send as a test gets through to any gmail account I try. Chilling. **The Solutions I Tried** * I started by running a test using mxtoolbox. It wasn't great, definitely got multiple auth failures and, ofc, DMARC failure. * I followed this up by going into the admin account on Outlook and just re-setting up everything here. * I had to do this in 2024 when Gmail first tightened their requirements. The one weird snag here is that in 2024