[vchkpw] feature request qmail-smtpd-chkusr

[Eduardo]

Hello,
I want to know your opinion about including this patch like an option 
(selecting in configure) on vpopmail code. Spammers generate a lot of traffic 
of emails to unknown users and server could stop it with this. Performance 
seems to be normal. Opinions?
http://www.interazioni.it/qmail/