Yes, 79sound.de can receive emails.
Yes, 79sound.de seems to be a legitimate domain.
A record
185.60.251.251
MX records
mx01.masterlogin.de
134.0.28.14
mx02.masterlogin.de
95.129.51.53
mx03.masterlogin.de
95.129.51.56
mxbackup.masterlogin.de
194.126.196.22