Yes, 444.com.de can receive emails.
Yes, 444.com.de seems to be a legitimate domain.
A record
162.255.119.236
MX records
eforward1.registrar-servers.com.
162.255.118.51
eforward2.registrar-servers.com.
162.255.118.52
eforward3.registrar-servers.com.
162.255.118.51
eforward4.registrar-servers.com.
162.255.118.52
eforward5.registrar-servers.com.
162.255.118.51