Mail does not show incoming mail, where to dig?

Question

Mail server

After transferring the sites to another vps, the incoming mail ceased to be displayed in the console, where to dig?

Physically, the files come to the server and are stored in the users folder
, but when called in the mail console, it is displayed that there is no mail ...

~/Maildir/new# ll
total 28
drwx------ 2 root root 4096 янв 31 06:25 ./
drwx------ 5 root root 4096 янв 30 19:02 ../
-rw------- 1 root root 1516 янв 30 19:02 1580400169.V801Ie056bM635879.mysite.com
-rw------- 1 root root  437 янв 30 19:06 1580400405.V801Ie056fM320559.mysite.com
-rw------- 1 root root 1340 янв 30 19:13 1580400836.V801Ie0570M899504.mysite.com
-rw------- 1 root root 1338 янв 30 19:13 1580400836.V801Ie0572M905510.mysite.com
-rw------- 1 root root  898 янв 31 06:25 1580441103.V801Ie1407M64518.mysite.com