I can't send emails out since installation of DSL - help??

Question

I use Entourage for my email program. Until 5 days ago, I had dial-up with Netzero.
Finally got DSL through my local phone company (Qwest*). Installed the modem - everything working fine, can get to the internet, can receive emails, but can't send out. (*I did not get email with the DSL, so I'm still using Netzero account).
I can go to Netzero's page and send from there, but can no longer send from Entourage. The Netzero techs are useless. Qwest tells me it's them, they tell me it's Qwest.
I've tried everything I can think of. Anyone have any ideas? I looked at other posts, but it's too overwhelming - I have no idea what putting 25 or 587 in my server port means, as I saw here, and as Netzero suggested. Where the heck is my server port.
Hope someone can help me.

Answer 1

Thanks - tried it, doesn't work, but got a new error message "Relaying denied" error 5553 -
Here are the steps Netzero had me go through:
1. Open Microsoft Entourage in your Microsoft Office X folder.
2. From the "Tools" menu, select "Accounts."
3. In the "Accounts" window, select the NetZero account.
4. Click on "Delete".
To configure Entourage for OS X to get NetZero email:
1. Open Microsoft Entourage in your Microsoft Office X folder.
2. From the "Tools" menu, select "Accounts."
3. In the "Accounts" window, click "New."
4. The "Account Setup Assistant" will appear. Type your name in the box and click the right-arrow to proceed.
5. On the "Email Address" screen, click the button next to "I already have an email address that I'd like to use" and enter your full NetZero email address (including the @netzero.net). Click the right-arrow to proceed.
6. On the "Mail Servers" screen, make sure the dropdown menu next to "My incoming mail server is a(n)" is set to "POP server."
7. Under "Incoming mail server," type pop.netzero.net
8. Under "Outgoing (SMTP) mail server," type authsmtp.netzero.net
9. Check the box next to My server requires authentication. In the Account name text box, type your email address with @netzero.com
NOTE: You must be logged on to NetZero in order to successfully send NetZero mail.
10. Click the right-arrow to proceed.
11. On the "Account ID and Password" screen, enter your full email address (such as [email protected]) next to "Account ID."
12. If you want to enter your password now so you don't have to enter it every time you check your email, you can do so in the box next to "Password." Make sure the box next to "Save password in my Mac OS keychain" is checked.
13. Click the right-arrow to proceed.
14. You will see a "Congratulations" screen. Enter a name for your new account (such as "NetZero Email Account") and click "Finish."
Note: Due to limits placed on mailboxes, you must complete the following steps to prevent your mail from being blocked or deleted.
1. From the "Tools" menu, select "Accounts."
2. Select the "Mail" tab and double-click your newly created NetZero account
3. Click the "Options" tab.
4. Under the "Server" section, ensure that the "Leave a copy of messages on the server" box is unchecked.
5. Click "OK" to save.
You may have to use an outgoing mail server that is
compatible with your internet service provider. I
think it may be "pop.dnvr.qwest.net"for Qwest,
without the quotation marks. Try using this outgoing
server and let us know what happens.