Re: very simple question about username/domain

[Gustavo Vieira Goncalves Coelho Rios]

Gustavo Vieira Goncalves Coelho Rios wrote:
> 
> i am writing a small utilities to play with username/domain under qmail.
> 
> I would like to known what are valid email address?
> Can some one point me to the URL(s) that specify such a thing?

Sorry for this mistaken, it's not the URL, but instead, ths RFCs.
The right sentence is:
Can some one point me to the RFC(s) that specify such a thing?