mailcow-dockerized/data/conf/mysql/my.cnf

[mysqld]
character-set-client-handshake = FALSE
character-set-server           = utf8mb4
collation-server               = utf8mb4_unicode_ci
innodb_file_per_table          = TRUE
innodb_file_format             = barracuda
innodb_large_prefix            = TRUE
#sql_mode=IGNORE_SPACE,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

[client]
default-character-set = utf8mb4

[mysql]
default-character-set = utf8mb4