Twitter account requesting a new email

This message is addressed to the community mods.

Last night, I opened Twitter and got this message on top:

Is your email address active? We’ve tried to send emails to economics@okfn.org but they are not getting delivered.
Please update your email settings or try sending a message again to your current address.

As far as I was told, that address is just a mask. How can I update it? To which address?

Thanks!