[RTTY] UK DX email addrese

[yc2ecg@softhome.net]

> <ukdx at scotham.net>:
> 216.93.241.130 does not like recipient.
> Remote host said: 550-"The recipient cannot be verified.  Please check all recipients of this
> 550 message to verify they are valid."
> Giving up on 216.93.241.130. 
> 

Does anybody now about the UK DX email addresse.
I have posted my log two times but currently have this reply.
Any information will be much appreciated. 

Regards,
yb2ecg, JON.
www.yc2ecg.blogspot.com