Email fails with Undeliverable

I tried to apply for a Developer Preview version for my Shield Tablet but for some reason the email address ShieldVulkanDev@nvidia.com gives me an Undeliverable message from all my mail accounts. Am I the only one with this problem?

Sorry that the email didh’t work for you; we have successfully received device information via ShieldVulkanDev@nvidia.com.

Could you please contact me via a private forum message so I can collect your device information that way?

I’m having the same issue:

"Delivery has failed to these recipients or distribution lists:

PF-shieldvulkandev@exchange.nvidia.com
There’s a problem with the recipient’s mailbox. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message, or provide the following diagnostic text to your system administrator."

edit: @Mathias_Schott, sorry for the multiple PM’s. The server these forums are hosted on is always acting up for me :/