In your Email client, feel free to configure multiple accounts with your reply/from address as many-different-names@youdomain.com. It really doesn't matter, as everything@yourdomain.com   will land in the default account.  Therefore, you would configure all of your email accounts with the "same" Username and Password as your "Default domain Email Account." 

EXAMPLE: Let's say you want to receive mail from dianne@yourdomain.com and mark@yourdomain.com. If both of these addresses are the ones you'll be using, then the only thing that changes is the address - the Username and Password is "always" the same.

The pop email account method:

In this case, you configure a "private" pop email account for one or many users who will be receiving and sending email from your domain. Once an email address is configured as a pop mail account, it operates privately and independently from your main standard/default mail system. Any mail sent to a private pop mail account "can only be received" by logging into that account with the separate username and password you have assigned it.

Your default "catch all" account will not intercept any mail being sent to a pop mail account, which is what makes it 'private'. Pop 3 accounts are useful if there are a number of people (for example employees) who would each need a private email account.

This way, everyone at your company can utilize private email. The default email address plays a slightly different role in this case:  If a sender uses the 'wrong' Email name or syntax, then that message would bounce to your "default catch all" account, and at which time, you could probably figure our who the sender was trying to contact. They do however, have to at least send it to your correct domain name, (i'e', oops@youdomain.com).  This would end up in your "default" mailbox.

How to configure a pop mail account:

1. Login to C-Panel
2. Select "Add/Remove accounts"
3. Select "Add Account"
4. Enter an email name
5. Select "Create"
Just enter a name, (the @yourdomain part is added automatically)

That's it, done! Your private pop 3 email account is now ready for use. If you're a little lost on how to manually configure an email account into your mail reader, please see the detailed tutorials on how to configure Outlook and Netscape mail readers.

Setting Your Default Email Address:

It appears pretty simple, but read through this documentation, as this controls much more that you'd expect.  As mentioned in the previous chapter, your "default email address" is the one, which can be used as a "catch all", or in other words, to "catch all mail", which is addressed to anything@yourdomain.com. Using a catch all can be a blessing and sometimes a curse.

The "catch all" is excellent if you have a high frequency of people whom mistype your email address, as these addresses (even though mistyped), will simply be bounced to your "catch all" or "default" email account. That is, providing they at least managed to spell your domain name properly :) 

If you're not planning on using multiple "private email boxes", then you can keep life very simple - just configure the default email address in your mail reader and leave it at that.  This way, you'll receive everything sent to your domain.  There are indeed pro's and con's to this method, which will be discussed in this tutorial.

Setting your default/catch all email account:

Note: By default, or until you change it, the default email address will be the same as your "login name."

1. Login to C-Panel
2. Select "Default Address"
3. Select "Set Default Email Address"
4. Enter a desired default email address
Enter a full email address to receive your default/catch-all email.

Select "Change" and you'll see a confirmation box, which displays your new default email address. That's it- done!

You should still make a habit of checking the default POP account that comes with your account on a regular basis.

Remember: In order to receive mail, which finds its way into your "Default Mailbox", you must configure the default address in your mail reader.  If you don't, then all mail, which bounces to this address will sit on the server unread.  This is easy to do in Outlook Express, as it allows you to configure and monitor multiple email accounts.  Email readers such as Netscape on the other hand, are limited to "one" email account. Actually, you could re-configure your mail reader to check your default email box every few days, but who wants to be bothered with that trouble?  We suggest using an email reader, which allows you to configure multiple email accounts. 

The Webmail Alternative: You can also check your default email account, or your other mail accounts by logging into it through the "WebMail" interface.  Simply select the "WebMail" icon at the bottom of C-panel, and log in to it using your "Main Account" Username and Password.  This will allow to to check your default email box, as well as other mailboxes without having to configure them in your mail reader.  In fact, using any pop accounts "Username and Password" will log you into that particular account through the "WebMail" interface.

The downside of enabling "Catch All":

Problems can sometimes arise when Spammers or junk mailers use this feature as a means to pump their trash into your mailbox. As long as the "catch all" is enabled, then all they must do is send to whatever@yourdomain.com and it will reach you.

On the other hand, if you're using "specific pop email accounts", you could opt to disable the "catch all", which would mean that "only visitors or associates who you've given a specific address to" can send mail to a particular email account on your domain. 

In this case, everything else, (that you have not configured as a pop mail account) is bounced back to the sender. In our opinion, we suggest leaving your "catch all" enabled for the time being. If Spammers begin sending random junk messages using anything@yourdomain.com, then you can disable your "catch all" feature.

Disabling your "Catch All Feature"

To disable enter the following for your default email address:

:blackhole:   This will discard any incoming email that is un-routed

:fail: no such address here   This will bounce all email that is un-routed back to the sender.

What happens now?

When Spammy or Jimmy junk mailer attempts to use a random email address to Spam you, it will be bounced back to them. That is, unless they happen to get a hold of one of your "legitimate pop email account names", in which case, you'd have a different problem on your hands. Yes, you could either deal with it, or change the address.

So what actually happened here?

When the "Catch All" email address (:fail: no such address here), attempted to process an incoming message from anything@yourdomain.com, and then forward the (junk message in this case) to the "catch all/Default" email address, it freaked out, and said forget it!!   The default email address was set to ":fail: no such address here" in this case, so the sending process was aborted. Therefore, the mail system bounced back the above error message to the sender. There are numerous tricks and special recipes you can 'manually' write into the Unix email system for doing essentially the same thing, however through C-Panel, this would certainly seem the easiest way of accomplishing the task.

Continued here.