I've been investigating an issue with emails showing up in outlook as first.name@ (without the email address), and it seems the email address is being sent as the display name like so
Within Outlook, the To: field is shown like so:
first.name@ <email.com firstname.lastname@example.org>
This seems to only be an issue in Exchange 2010 (the company I work for still uses it), I did a few tests using Gmail and it just fine.
Is this a specific issue to Exchange 2010? i.e would this issue be resolved in a newer version?