We are looking to employ a contractor to build a Postmark integration for Mautic 5. We currently have about 75k contacts and would likely be sending about 50k broadcast emails per week. We will be wanting to have this plugin open-sourced, but are willing to pay for the initial development. The plugin should be able to call the Postmark API or handle the webhooks so that error, spam, etc are accounted for correctly. We are also expecting this integration to be able to send the email fast.
Please DM me with proposals.