Email address not working on: https://github.com/OfficeDev?utf8=%E2%9C%93&q=add-in&type=&language=
I have tried to send an email to the address: firstname.lastname@example.org and it got returned. It might be possible that only certain people can do this, if so, maybe you should hide it from the site? Thanks
Thank you for reporting this issue. We had some issues with the email box and those should be now be resolved.
Office Extensibility Team