Yes, 799000.ru can receive emails.
Yes, 799000.ru seems to be a legitimate domain.
A record
193.200.73.253
MX records
alt1.aspmx.l.google.com
64.233.186.26
alt2.aspmx.l.google.com
209.85.203.27
aspmx.l.google.com
172.217.197.26
aspmx2.googlemail.com
64.233.186.26
aspmx3.googlemail.com
209.85.203.26