Steps

1. Get the current version of Stalwart Mail.

   • current version: v0.8.0

2. Check the documentation for the latest version.

   • upgrading documentation: https://github.com/stalwartlabs/stalwart/blob/main/UPGRADING.md

3. Upgrade to the next major version incrementally

   • next major version: v0.9.x
   • next major version: v0.10.x
   • next major version: v0.11.x
   • next major version: v0.12.x

4. Fix issues that arise during the upgrade process.

   • issue: failed to start when using v0.11.0 root causes:

     • https://github.com/stalwartlabs/stalwart/issues/1057
     • https://github.com/stalwartlabs/stalwart/issues/1104

     resolution: use v0.11.3 when upgrading from v0.10 to v0.11