Techniques are described to provide content channels for electronic messaging. In an implementation, a content channel may be configured to contain multiple content portions having various types of content for delivery to one or more clients. The content channel may be associated with an electronic message such as an email or instant message. The content channel and updates to the content channel may be pushed to the clients as electronic messages in an electronic messaging environment. The clients may expose a user interface having one or more portions that are arranged to present and provide interaction with the content channel. The content channel may be pinned within a designated portion of the user interface to enable repeated access to the content channel via the designated portion.