Gitlab email not work

Hi,
The email function of gitlab is not working at my institute.
It was installed by a former colleague in our institute with docker following the instruction:

Here is the code of how gitlab was installed :

docker run --name=gitlab_redis -tid sameersbn/redis:latest;
docker run --name=gitlab_mysql -tid -e ‘DB_NAME=gitlabhq_production’ -e ‘DB_USER=gitlab’ -e ‘DB_PASS=password’ -v /opt/gitlab/mysql:/var/lib/mysql sameersbn/mysql:latest;
docker run --name=gitlab -d -itd
–link gitlab_mysql:mysql
–link gitlab_redis:redisio
-e ‘GITLAB_PORT=10080’
-e ‘GITLAB_SSH_PORT=10022’
-p 10022:22 -p 10080:80
-e ‘GITLAB_HOST=192.168.5.250’
-v /home/git/gitlab/:/home/git/data
-e ‘SMTP_USER=colleague@institute.com’
-e ‘SMTP_PASS=9894664’
-e ‘SMTP_DOMAIN=mail.institute.com
-e ‘SMTP_HOST=mail.institute.com
-e ‘SMTP_PORT=587’
-e ‘GITLAB_BACKUPS=daily’
-e ‘GITLAB_EMAIL=gitlab.local@institute.com’
-v $(which docker):/bin/docker
-v /opt/gitlab/log:/var/log/gitlab
sameersbn/gitlab:latest

the colleague@institute.com is the mailbox of the colleague. When he left, colleague@institute.com was deleted. gitlab.local@institute.com was also deleted, and now created with password “gitlab.local.pass”.

I am wondering if there is a way to change SMTP_USER to me@institute.com and SMTP_PASS to “my pass” without affecting the current functions of gitlab.

Another question: I think in the code above, there is no setting of the password for gitlab accessing the mailbox “gitlab.local@institute.com”, but gitlab.local@institute.com had sent the emails to us. Is there any need to set the password and how?

Any hint could be appreciated.
Thanks