The way you handle multiple e-mail addresses in Outlook Express (OE) depends on how the
ISP creates them.  There are 3 different ways depending on the ISP:

1) Multiple e-mail addresses feed into a single server POP3 account.  In this case, all
users use the same Dial-up Networking connection (DUN) and same Logon Using in OE at
Tools, Accounts, Mail, Properties, Servers.  Each OE account has different settings in
Tools, Accounts, Mail, Properties, General.  This is the poorest ISP support.  You must
use message rules to not download messages for the other e-mail addresses.  You will be
limited on properly separating the mail.

2) Separate server POP3 accounts, single ISP logon.  In this case all users use the same
Dial-up Networking connection (DUN) but different Logon Using in OE at Tools, Accounts,
Mail, Properties, Servers and General.  This is the adequate ISP support.  Often the first
mail account has the same name and password as DUN.  You can use separate identities
(File, Identities) to keep your mail separate (best), or use Message Rules to sort
downloading mail by using "where the message is from specified account".

3) Separate server POP3 accounts, separate ISP logons.  In this case each user uses a
different Dial-up Networking connection (DUN) and different Logon Using in OE at Tools,
Accounts, Mail, Properties, Servers and General.  This is the best ISP support in that it
provides maximum privacy.  You should use separate identities (File, Identities) to keep
your mail separate or separate Windows User Logons.

Sounds like you have a type 1 ISP.

As for the order that OE downloads accounts, you have no real control over that.  Some
people have found that the accounts download in the reverse order that they were created
in, but for others, that doesn't seem to work.

--

Mike - http://pages.prodigy.net/michael_santovec/techhelp.htm

If your email addresses are all "aliases" for one mailbox, you'll still need
Message Rules when using separate Identities/Log-ons (neither of which are
really necessary).

Most families (an intentionally all-encompassing term) will have one Mail
Account with their one ISP subscription ($$/month for all).  Most ISPs
provide you with multiple Addresses for the Mail Account (e.g., Me@ISP.com,
You@ISP.com, etc.) but all of them "point" to the one mailbox.  As such,
each Identity will need to use Message Rules so that only mail addressed to
them is downloaded into their Inbox.

The following refers to two addresses, but you should be able to follow it
and amend for three or more.

Me@ISP.com and You@ISP.com are aliases for one Mail Account (mailbox).  In
the Identity associated with Me@ISP.com, create a Message Rule stating,
"Where To or CC contains You@ISP.com, Do not download it from the server"
and place this rule at the very top of the list.

Then create a similar rule for the Identity associated with You@ISP.com
directing any messages addressed to Me@ISP.com not to be downloaded from the
server.

Also see MVP Tom Koch's fine pages on using Rules:

Message Rules Tips
http://insideoe.tomsterdam.com/tips/rules.htm

Why doesn't my rule work?
http://www.tomsterdam.com/insideoe/faqs/why.htm#rules