Yes, 31bel.ru can receive emails.
Yes, 31bel.ru seems to be a legitimate domain.
A record
95.216.2.95
MX records
alt1.aspmx.l.google.com
64.233.186.27
alt2.aspmx.l.google.com
209.85.202.27
aspmx.l.google.com
172.217.197.27
aspmx2.googlemail.com
64.233.186.26
aspmx3.googlemail.com
209.85.202.26
aspmx4.googlemail.com
142.250.13.26
aspmx5.googlemail.com
172.217.218.27