Could you please tell - if I can use documentserver+communityserver+controlpanel+mysql docker containers without to up onlyoffice/mailserver container?
My clean install is described here
This question was previously asked here but the topicstarter seems not opened new issue, so I try right on community.onlyoffice.com.
Thank you
Hey @derkontakt, 
You can definitely set up Workspace without running the onlyoffice/mailserver container.
To make this easier, try using our installation script with a custom parameter to skip the mail server:
https://helpcenter.onlyoffice.com/workspace/installation/workspace-install-docker-parameters.aspx
bash workspace-install.sh -ims false
This will install all ONLYOFFICE Workspace components without including ONLYOFFICE Mail.
Let me know if I missed anything!