Polish Email Address not working

Hi All - wondering if you can help me I am trying to contact a Crossfit Gym in Krakow and my outlook (in London) keeps on telling me that it cannot deliver to the email address - kontakt@crossfit.krakow.pl

Just wondering if I need to change anything on this email address so that I can make contact from London?

Appreciate your help.

This email address seems valid - the same is on their website.
What is the detailed message from your outlook mail delivery system?
Maybe try send another email directly through a web page or use an different email account.

The address is in the correct format and according to their site the address is spelt correctly correct.

If the emails are being knocked back, it's for another reason. Their website is working, so it can't be that they haven't paid their bill for the domain. It could be a temporary issue. Try phoning them, someone there will probably speak English.