On 17/05/2016 08:01, Brian Gaff wrote:
This is normally your isp getting one or more of its mail servers listed for
spamming or some other nasty crime.
The only answer usually is for the ISP to get it unlisted.
This is why it can be very handy to have several portable email addresses
like google and Yahoo, as at least you can let friends know what is going
on. I'd find it hard to see any reason for this message which is caused
locally on your machine.

Brian

Many thanks for all you replies. I think that is was possibly IDNet,
this morning it is working fine. Again many thanks to you all, though to
be honest a lot of the replies were over my head, however I appreciate
the help.
cheers