The official MEI mailing list, MEI-L, is used to inform the community about upcoming events, discuss possible improvements for MEI, evaluate encoding strategies and models, and get support from the full community.
The list is open to anyone for subscription, and everyone is welcome to join MEI-L by subscribing to: https://lists.uni-paderborn.de/mailman/listinfo/mei-l.
Also, the archives of the list are open to the public and can be browsed online: https://lists.uni-paderborn.de/pipermail/mei-l/.
MEI has a Slack channel that is used for discussion, questions, announcements, and collaboration, https://music-encoding.slack.com.
To join, please fill in our Slack Invitation Form and you will receive an invitation.
Slack has clients for Mac, PC, Linux, and mobile devices, and may be used via any web browser.
You can also contact MEI by email.