My emails are sent using bigthinka.net, to retain my own email address rather than use my sky.com one, following advice on this forum.

I am now getting a lot of them bouncing and one of the reasons is

554-mk-inboundfilter-1-a-1.b2b.uk.tiscali.com
<<< 554 Sorry, I am not accepting mail from 89.145.79.6 due to its poor reputation.>>

That IP belongs to avenger.unitedhosting.co.uk whom I have never come across before. Is this something to with Bigthinka or is it another problem.

Any help gratefully appreciated

R