Update server/mail.py

Removed "Gmail" from the match requirement for forwarding.  This is to enable gmail users with their own domains to participate.  

For reference this is what an email forwarding request looks like from gmail from a different domain.

Subject: (#43643746) Emarf.net Forwarding Confirmation - Receive Mail from dave@emarf.net
Merge pull request #4 from framed/patch-1

Support Gmail forwarding requests from non @gmail.com addresses
Merge pull request #5 from ichthyos/master

Replace watch/unwatch links after intel map update
Extension version bump
update to include address in e-mail alert
Merge pull request #6 from ghchinoy/patch-1

update to include address in e-mail alert
Add support for the southern hemisphere (duh)
Fix for OAuth tokens on requests that contain query params
Stop invalidating the all portals cache, to decrease datastore read operations
Update icon
Chunk the portals.json in memcache since it's getting too big
Merge branch 'master' of https://github.com/metzen/ingress-notify
Adjust the forwarding registration handler to account for non-English languages
Handle incoming emails without a subject line
Only handle notification mails coming from ingress-support@google.com
Add a hover background color for portals list (Issue 7)
Added attacker name to notification message.