In the case you have been using previous version 0.9.5-1 and want to use you database please follow instructions.
Prior you start this container upgrade database scheme.
USE vmail;
ALTER TABLE admin \
MODIFY passwordlastchange DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01', \
MODIFY created DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01', \
MODIFY modified DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01';
ALTER TABLE alias \
MODIFY created DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01', \
MODIFY modified DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01';
ALTER TABLE alias_domain \
MODIFY created DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01', \
MODIFY modified DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01';
ALTER TABLE domain \
MODIFY created DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01', \
MODIFY modified DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01';
ALTER TABLE domain_admins \
MODIFY created DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01', \
MODIFY modified DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01';
ALTER TABLE mailbox \
MODIFY lastlogindate DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01', \
MODIFY passwordlastchange DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01', \
MODIFY created DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01', \
MODIFY modified DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01';
ALTER TABLE recipient_bcc_domain \
MODIFY created DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01', \
MODIFY modified DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01';
ALTER TABLE recipient_bcc_user \
MODIFY created DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01', \
MODIFY modified DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01';
ALTER TABLE sender_bcc_domain \
MODIFY created DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01', \
MODIFY modified DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01';
ALTER TABLE sender_bcc_user \
MODIFY created DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01', \
MODIFY modified DATETIME NOT NULL DEFAULT '1970-01-01 01:01:01';