Developer Guides

Setup walkthroughs, migration steps and honest comparisons — written by the people who run the mail servers.

How to Sign Your iOS App (.xcarchive) and Publish It to the App Store

You generated a branded iOS app from your rebrand dashboard and downloaded an .xcarchive.zip. Here is how to sign it and ship it to the Apple App Store.

June 1, 2026

Developer Guides•3 min read

How to Sign Your Android App (.aab) and Publish It to Google Play

You generated a branded Android app from your rebrand dashboard and downloaded an .aab file. Here is exactly how to sign it and publish it to the Google Play Store.

June 1, 2026

Developer Guides•2 min read

How to Distribute Your Branded Desktop Email App (Windows, macOS, Linux)

You generated branded desktop installers from your rebrand dashboard. Here is how to code-sign, notarize, and distribute them to your customers on every platform.

June 1, 2026