Beta release

MMBS Beta release notes.

The Beta channel is optional and testing-only. Stable remains the recommended MMBS extension for normal Gmail mail merge campaigns.

Download MMBSStable Release
Testing onlyBeta testing

Optional beta testing channel

This release is separated from the production build so future MMBS changes can be tested without confusing normal Gmail outreach users.

  • Use only when intentionally testing future MMBS behavior.
  • Testing-only. Use stable for production Gmail campaigns.
  • Stable remains the default channel for normal users.
Private betaBeta Details