Yes, 90mas10.com.ar can receive emails.
Yes, 90mas10.com.ar seems to be a legitimate domain.
A record
162.241.16.14
MX records
alt2.aspmx.l.google.com
209.85.202.26
alt4.aspmx.l.google.com
172.217.218.27
aspmx.l.google.com
173.194.205.26