Where should I put the file =?iso-8859-1?Q?=22tcp.smtp.cdb =22?= and =?iso-8859-1?Q?=22tcp.smtp=22?=

[com]

HI:

I've install the vpopmail 4.9.7,and I read the FAQ and INSTALL carefully.
But I'm confused!
Where should I put the file "tcp.smtp.cdb " and "tcp.smtp"?
Some time it said "~vpopmail/etc/tcp.smtp",some time it said 
"/etc/tcp.smtp".
I've try many time to setup "enable-roaming-users",but I've failed!
vpopmail runs tcprules to regenerate the /etc/tcp.smtp.cdb file?
or the ~vpopmail/etc/tcp.smtp.cdb file?
The  default relay time is 1 hour or 3 hour ? 

Thanks