Login by alias

Martin Miller <[email protected]> Fri, 6 May 2016 13:03:32 +1200
Newsgroups gmane.mail.cgatepro.general
Message-ID <[email protected]>
Hi,

Is there a simple setting to force users to log in by their account name
and not an alias?
I have a few aliases to my accounts and am seeing them blocked by
dictionary attacks with failed password attempts.

-- 
MJM