We're setting up a redirection-based mail server with a lot of complex moving parts, including the standard ones that apply to everyone like SPF/TLS as well as the more complex ones needed to ensure redirect mail gets accepted like SMTP authentication for Gmail, SRS, DKIM and the SPF complications that arise.
I've been sending messages to gmail and inspecting the headers myself, but it's tedious and easy to miss problems. What I'd like is a service where I can send an email from our server (or from a SMTP-authenticated Gmail account) and get a report about the various technologies and whether they are working or not.
Note that I'm not looking for a tool to assess a mail server from outside, as http://mxtoolbox.com/ already does a great job of that as well as many other things. Another similar tool with slightly different coverage is http://www.intodns.com/ Both of these are really useful but only for testing your server from the outside. I want a service that recieves email and assess the aspects that can only be tested at that point in the process.