MimestreamThis polished and feature-rich Mac email client is optimized for use with Gmail and has built-in OmniFocus integration.
Spark Mail A polished email client with a focus on email prioritization. Spark Mail also has innovative support for teams and integration with OmniFocus.
Airmail An email client that allows you to create OmniFocus actions that reference emails, manually or automatically using rules.
SaneBoxA web-based service that helps you tame your email and that reduces the need to create and manage Waiting items in OmniFocus.
Postbox An email client for Mac and Windows that's speedy, customizable, and extensible. The Mac version includes native support for OmniFocus.
Mailplane An email client that combines Gmail's web interface with a slew of additional features, including integration with OmniFocus.
