UK delivery not available?

I am trying to order A350 rails from the store on the sale offer but I get a message that “some items in your cart can’t be shipped to the address you entered. Please contact our customer service: info@snapmaker.com, we will assist you to solve the problem within 24 hours” When I email either info or support it gets returned with:-
support@snapmaker.com

host mxbiz1.qq.com [43.154.252.185]

SMTP error from remote mail server after end of data:

550 Mail content denied. http://service.exmail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1000726

So two questions - is the 50%sale offer available in the UK and if so how? and what is with te email system?

I realise this isn’t the right place for the questions but if email isn’t available I seem to have no choice.
Take care

qq’s mail server is obnoxious, although you don’t seem to be getting the specific “frequency limited” message that’s the most common problem state. Try again from a different email address, if you have one.