We used this and discovered that our "authenticated" Mailchimp campaigns were actually failing to be validated properly, and some email systems (especially corporate systems with spam filtering appliances like Barracuda) were not delivering our email. DMARC didn't help tell us that our mail wasn't being delivered, per se, but once we made a change (our own spf/dkim records, along with other DNS-related changes) and stopped using Mailchimp's authentication, our following campaigns have seen a higher deliver rate (evidenced by more opens, clicks, and OOF responses for campaigns that aren't fundamentally different).
I'd also recommend, in addition to Postmark's tool (not in place of), checking out https://dmarcian.com. You can use both at once for DMARC aggregate reports, and additionally forward the forensic DMARC reports to dmarcian for analysis.
It's been said before, but email deliverability is hard. Thank goodness tools like this are around to help us mere mortals understand more of it, and protect the repute to of our domains in the process.
Hi spdustin. Thanks for the comment. Deliverability is crucial, and that's one reason we built our free DMARC tool. We want anyone sending transactional email to have their emails reliably delivered to the inbox. dmarcian looks like a great tool as well, so thanks for recommending it.
I'd also recommend, in addition to Postmark's tool (not in place of), checking out https://dmarcian.com. You can use both at once for DMARC aggregate reports, and additionally forward the forensic DMARC reports to dmarcian for analysis.
It's been said before, but email deliverability is hard. Thank goodness tools like this are around to help us mere mortals understand more of it, and protect the repute to of our domains in the process.