Outlook Express - problem with responding to email

In our corporate environment we do not support Outlook Express while using Windows XP and Office 2003. What is the provider of your email? (such as yahoo, hotmail, etc.)
What is the kind of it -- POP3? IMAP? or MAPI? Exchange server? etc.

This is the second time I have been redirected because my question didn't fit the topic.

My email provider is through my Cable service: Wide Open West and it is  POP3. I have had this service for two years and used Outlook Express for just as long, but have never had this problem until a week ago. I have not added any new programs or changed settings.

I don't know what is happening now with Cable West but my state of Virgina cable (Cox dot net) just spent Tuesday and Wednesday totally revamping their email, including major overhaul of the web access.
What happens when you use your Cable West web access to operate the email?
What I am trying to determine is a separation between Outlook Express as an issue and the email itself which Outlook Express works with.
If you prefer not to go this route or already know the answer, it seems to me working with flavors of Outlook since 1997 that usually one can get some different behavior by doing another account definition (for the same account) or at least going through all the settings one by one. When I do that, I usually answer my own question in the process of defining the problem to someone else. If you genuinely want help on the forum(s) then you will need to provide details when requested by those interested in helping.

Wow!! That makes sense! Thank you so much. (I was worried that I would have to uninstall and reinstall Outlook Express.) :)

What you've said could also explain why this is happening with the same email addresses over again. (I just realized that today.)

Whenever you may be creating the new definition of the account information (or reviewing the original) I assume that one is of the form "POP." or "POP3." and another of the form "SMTP."
One is for receive and one is for send. If the send is failing then there may be some adjustment needed in the corresponding entry.
Systems especially do not like "open relay" email sending.
Just today, someone here on our campus was able to read in Outlook express but cannot Send (while here). The reason is that our school does not allow "relaying" and an email for some other domain trying to 'Send' through/from our domain is automatically prohibited (because it is considered Spam). If, however, the send value is OUR domain, the it would happily send.

Do you have 'full blown' Outlook, either 2000 or 2002 (XP) or 2003?
Also, do you have the option of web-based email for the same account?
For my Cox dot net account, I do all my 'remote' reading and sending using webmail but when I am at my home base, I actually use the Thunderbird email client (from the folks at Firefox) and it looks and acts a lot like a better version of Outlook Express.
Are you needing more assistance with getting what you need?
If not, over and out (and the best to you).

Yes, thank you. I think that I have the help that I need on this issue. Thank you so much for taking the time to help me!

By the way, I have Outlook Express 6 and Microsoft Outlook 2003. I don't often use Outlook 2003 because I've been getting emails that do not contain text. (For instance, my inbox lists the email's arrival date and time, but not the sender or subject.) When I click on the email to "read it," the body only exists of Internet "post office" information. However, when I then check my Outlook Express, the emails with the missing text in Microsoft Outlook appears intact in the Outlook Express inbox.

The reason why I have both hooked up is because I first started using Microsoft Outlook and all my addresses are in there. When I began having problems with MS Outlook, I  switched to using Outlook Express.