My usename is phone number and I cannot login

[Do Duc Huy]

Hi all!
I 'v tried to setup my system to use user phone number for username. But when I login, the system said that "invalid user". I know this problem is cause of my username. Is there any one know how to do for my system so that it can accept this type of username.
I 'v used postfix-2.0.7, cyrus-imap-2.1.12, openldap-2.1.12 and Redhat Linux 7.3 for my mail server
Thanks in advance
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Do Duc Huy 
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