Yes, 52dn.net can receive emails.
Yes, 52dn.net seems to be a legitimate domain.
A record
None
MX records
mx1.pub.mailpod2-cph3.one.com
185.164.14.6
mx2.pub.mailpod2-cph3.one.com
185.164.14.7
mx3.pub.mailpod2-cph3.one.com
185.164.14.8