amavisd -u amavis -c /etc/amavisd/amavisd.conf debug
Mar 19 14:22:06.415 ftp2.xxx.lt /usr/sbin/amavisd[9728]: logging initialized, log level 0, syslog: amavis.mail
Mar 19 14:22:06.415 ftp2.xxx.lt /usr/sbin/amavisd[9728]: sd_notify (no socket): STATUS=Config files have been read, modules loaded.
Mar 19 14:22:06.415 ftp2.xxx.lt /usr/sbin/amavisd[9728]: starting. /usr/sbin/amavisd at ftp2.xxx.lt amavisd-new-2.11.1 (20181009), Unicode aware, LANG="C"
Mar 19 14:22:06.415 ftp2.xxx.lt /usr/sbin/amavisd[9728]: perl=5.016003, user=amavis, EUID: 994 (994); group=, EGID: 991 (991)
ERROR: MISSING REQUIRED ADDITIONAL MODULES:
DBD::mysql

Fix:
yum install "perl(DBD::mysql)"