Authentication in 5.0pre3

[Elric]

I run a FreeBSD 4.3 system which allows the _ char in usernames. 
Currently I use vpopmail 4.9.10 and it works fine. But, 5.0pre3
fails with a user not found:

Sep  6 11:56:45 colossus vpopmail[46550]: vchkpw: vpopmail user not found 
[EMAIL PROTECTED]:127.0.0.1


Matt Ford