I’m mailing this social web feature request to the info@ address as it should reach some authoritative person at Google. At least according to some SMTP RFC I once read.
I’m a big fan of the federated social web and would very much like to see the Webfinger discovery protocol implemented on the gmail.com domain, mainly in order to find your users’ OpenID providers in a standardized way. (i.e. /.well-known/host-meta -> xrd lookup -> user data including OpenID server).
It would definitely help boost OpenID usage as a lot of people have a Gmail address – which is much easier to remember and type than the Google account OpenID provider url. It would also enable a federated web friendly version of the various “Connect” login options that the major asocial web service companies offer.
<email@example.com>: host aspmx.l.google.com[220.127.116.11] said: 550-5.7.1 The
user or domain that you are sending to (or from) has a policy that
550-5.7.1 prohibited the mail that you sent. Please contact your domain
550-5.7.1 administrator for further details. For more information, please
visit 550 5.7.1 http://support.google.com/a/bin/answer.py?answer=172179
ig6si37627458lab.30 (in reply to end of DATA command)