I have been using Outlook 2007 without a problem for ages now. However, as of last night I can no longer send emails, although receiving them is fine. I am with Onetel (have been for about 10 years) and I'm using Windows XP. The error message I'm getting is: 'Your outgoing (SMTP) e-mail server has reported an internal error. If you continue to receive this message, contact your server administrator or Internet service provider (ISP). The server responded: 554 <84-43-120-2.ppp.onetel.net.uk[22.214.171.124]>: Client host rejected: Access denied'.
I contacted Onetel and they told me to change my SMTP server which I did, but it made no difference. I was then told to delete the account and set it up again, but this time it wouldn't set up. Eventually, I managed to reset it, just with the incoming server but still, the outgoing server won't work. They told me that they've tested it and it's fine. I can send using their Mailzone system, but not within Outlook.
I went to my son's computer and he's running Windows 7. I logged into his email and he's having the same problem with sending emails, although again, receiving is fine. Both machines have Norton installed and automatic Windows updates. Do you think it could be an update which has done this?
Any help gratefully received!