User Admin: mail address check too rigid?

[MatsWolpers]

i am playing with TL 1.9.0 in xampp.
i notice that i am not allowed to create users with mail address user@myServer.local even though myServer.local is a valid dns entry and responds to ping. i can, however, make a mail address entry for user@myServer.net, even though this is not a valid dns name and unresponsive to ping.

why is that, please?

[fman]

valid or invalid email address has nothing to do with DNS entry and ping.
We are using email checking provided by EXT-JS framework
You can find more info about why an email is valid or not doing some search on Internet to found :
http://haacked.com/archive/2007/08/21/i ... til-i.aspx