Quota problem with vqadmin

Hello everybody!

 

I've got a little problem with Vqadmin. I'm trying to change the user quota for a normal user, using the toaster vqadmin interface, but my browser answer me an error: 

"Please type a valid email address"

That user works normally, he sends and receive email without any problem. Now I changed his quota manually on the mysql database, and it works, but I would like to understand the problem. User has a two character username:

[email protected]

but I think that this is not the problem.

Thanks in advance

Giuseppe Meniconi