Question about Outlook Express

Hi over the last couple of days I have had some problems with 2 computers accessing email accounts.

One computer which had been working ok suddenly dropped all access to sending or receiving emails - this had to be reprogrammed and still only partially works but I can't access send or receive any work related emails address' on it

However my main computer has been using the same set up for quite a while suddenly cant send emails with this error code

An error occurred while sending mail. The mail server responded:  Too many messages (2.4.1.1)

I have tried everything - but to no avail - and have cleared the sent folders but still the same.

I did notice that BT (who are also my internet providers) were working next door yesterday  so question... would them working on the lines and trying to add fibre optic in the area do this ? or is a computer glitch ?

any help would be greatly apprecaiated !

Thanks

      I am using window live mail as an email client on my desktop and configured my pop account into it. In the starting everything was going fine. But from last two weeks I am facing an issue, when I am trying to forward an email using window live mail from send items or inbox, the forwarding page is taking too long time to open i.e. nearly 20 to 25 seconds or more. It seems that there might be some issues of viruses or something is blocking it from opening. This is quite awkward.

      I have tried my best doing repairing of wlm and uninstalling and installing it again, scanned with malwarebytes and other software too, but nothing works. I have also searched for help online, tried but same nothing works.
      Overall request someone to please help me out of this situation. I would be kind thankful to his/her kind attention to my query.