The two primary mailing lists (jenkinsci-users and jenkinsci-dev) have a large number of subscribers, and moderate daily email volume, please strive to be clear and concise when sending messages. How to ask questions the smart way.

English-language discussion lists

jenkinsci-users@googlegroups.com

Mailing list for users of Jenkins. Post your questions on how to use Jenkins and Jenkins plugins here. If you're not sure which list is correct, post here.
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jenkinsci-dev@googlegroups.com

Mailing list for developers of Jenkins. Post your Jenkins core development and plugin development questions here, as well as topics related to project governance. Questions that should be asked on the jenkinsci-users list will be ignored. Do not cross-post.
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events@lists.jenkins-ci.org

Mailing list for events, meet-ups, and fostering local communities.
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jenkinsci-jam@googlegroups.com

Mailing list for Jenkins Area Meetup coordination.
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infra@lists.jenkins-ci.org

Mailing list for jenkins-ci.org operations and infrastructure.
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jenkinsci-docs@googlegroups.com

Mailing list for collaborating on Jenkins user and developer documentation.
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Discussion lists in other languages

jenkinsci-br@googlegroups.com

Jenkins grupo de usuários em Português do Brasil
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jenkinsci-ja@googlegroups.com

日本語ユーザーおよび開発者の為のメーリングリスト
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jenkinsci-kr@googlegroups.com

Jenkins users list in Korean
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Read-only lists

jenkinsci-advisories@googlegroups.com

Security Advisory announcements are sent to this list. More about security advisories.
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jenkinsci-commits@googlegroups.com

Automated core and plugin commit notifications.
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jenkinsci-issues@googlegroups.com

Automated notifications from JIRA (JENKINS project only).
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