https://postmaster.google.com/
Obviously it was launched recently as the data is available only for the last few days.
What I do like in the interface:
- DKIM / SPF / DMARC related data
- domain and IP reputation info available
- a lot of smaller data points
The only weak thing is DNS-only confirmation flow for domain. Small or non-IT companies might end up not getting that access or waiting for a few day which isn't ok in case of an email deliverability crisis.
Here goes a screenshot:
