Adding email users ids

I have REDHAT 9.0 linux server with DNS, sendmail, IMAP pop3 installed while OS installation.
I have created a user 'ads' while OS installation.
real domain 'xxx.com' is set on DNS server and it works fine.

I can send and receive mails my email id "ads.xxx.com" .
I can access 'ads.xxx.com' mailbox on server from Win client with Outlook express.
Everythibg works fine.
Now I need to create some more accounts 'ads1.xxx.com' , 'ads2.xxx.com' etc.
I have created these account on Linux but While accessing these mailboxes I get POP3 error.

Is there any other way to create these new email id accounts on server.
Thansk for support.

An email account would look something like ads@xxx.com. Is that what you mean, or do you want to add a new domain from which to recieve mail?
To create a new email account, just add a new user, it will accept mail, and you can retreive the mail with that user's password.

Hi,
I added user ads1, ads2 to Linux server with password.
Then send email to ads1.xxx.com and ads2.xxx.com from yahoo.com. Created two new email accounts on outlook express. Tried to connect to server from outlook exoress. But got following error.
#############
There was a problem logging onto your mail server. Your Password was rejected. Account: 'Mail', Server: 'mail.xxx.com', Protocol: POP3, Server Response: '-ERR Bad login', Port: 995, Secure(SSL): Yes, Server Error: 0x800CCC90, Socket Error: 998, Error Number: 0x800CCC92
##########

With same setting of Outlook express I can access to my first accout ads.xxx.com.

Is there anything like making new users for POP3?

Thansk for support.

You do realize that to access an account you would type ads1@xxx.com, right? NOT ads1.xxx.com...

To see if it's setup right why don't you try telnetting into it...

if you get messages like OK+, and no error messages, then you're account should be setup fine..

Thanks for support obi_wonton.
Problem was with Gnome GUI interface of Linux Redhat server. It was not creating pasword for user properly.
Then I created users with "useradd" command, created users and now it works fine.
Thanks