Redmine

I propose adding the project identifier to the List-Id header field of notification emails. Currently, the List-Id is based on the emission email address (Setting.mail_from). I want to change the List-Id to include both the project identifier and the emission email address.

The current notification email headers include the X-Redmine-Project field, which contains the project identifier. However, widely used email services Gmail do not support filtering based on custom headers starting with X-. This makes it difficult to create filters based on the project.

By including the project identifier in the List-Id, users can utilize Gmail’s list operator to create filters based on the project. This enhancement would improve the ability to organize and manage project-related emails in Gmail.

Current Implementation:
For an emission email address of redmine@example.net, the current List-Id is:

List-Id: <redmine.example.net>

Proposed Implementation:
For an emission email address of redmine@example.net and a project identifier of ecookbook, the proposed List-Id is:

List-Id: <ecookbook.redmine.example.net>

Backward Compatibility:

Changing the List-Id header field value will affect users who depend on the current format. To address this, we may need to add a new setting in Administration > Settings page allowing users to choose whether to include the project identifier in the List-Id. This ensures that existing workflows relying on the current List-Id format remain unaffected.