I have Outlook Express 6 and just recently I discovered that I can not send emails to recipients with Hotmail or MSN addresses. I can receive emails from them, but my emails bounce back when i try to send to them. Is it my settings or do I need to delete and reinastall Outlook Express?
Are you able to send mails from your Webmail? Some ISP do have limitations on number of emails that can be sent out per day. You will need to contact your ISP (email provider) and see if there is any restrictions. However, as you mentioned that it does not work only with MSN / hotmail domains, there maybe restriction on your ISP for these domains.