thousands of files in root mail directory

I have found thousands of files / folders in the main email directory, they are not in any domain and they all follow a common name sequence, such as knowing what is generating it or if I can delete them? there are more than 300,000 files that are in mail/

administracion.cur.1579676580_M171992P1712720_hosting_com,S=16411,W=16655:2,	0	0 bytes
administracion.cur.1474483875_M995408P329403_hosting_com,S=8443,W=8593:2,S ...............