To fix issue “Table ‘./eximstats/failures’ is marked as crashed and should be repaired ” please perform the following commands as root
root@server [~]#mysql
mysql> use eximstats ;
Database changed
mysql> truncate table failures;
Query OK, 0 rows affected (0.11 sec)
mysql> quit
root@server [~]# mysqlcheck -c eximstats
And then check again,,,