Sorry - hope this is clearer:

I have two pcs - both run MWP with OE6 and have had Norton removed. 1 of them is working fine with Avast including email scanning, but the other is giving this error message and now cannot send any emails using OE6. Both errors seem to refer to an issue with Port 25 being blocked.

When you say you need the original settings assigned by the ISP, can you be more specific please?

Many thanks again,

Tony