The original Postal has no WoW Forever version, but Postal Community Edition does. The community-run version of Postal added a Forever file (Postal_Camelot.toc) in version 4.4.6 on 9 November. The original's CurseForge page still lists only Retail and the Classic games. We checked both on 11 November.

Mail add-ons that work in Forever

Add-on What it does
Postal Community Edition The community version of Postal: mailbox tools for collecting and sending
Postbox Replaces the mailbox and collects everything in one pass. Its TOC lists Forever (version 1.60.0, 5 November)
Favorite Contacts Buttons for the characters you mail most
Flag Up Posts items you've picked to the right alt when you open a mailbox

If you used Postal before, Postal Community Edition is the closest match. Install one mailbox add-on, not two: they'd fight over the same window.

Until then

  • Open auction mail in batches after you've sold, rather than after every sale.
  • Use the game's own mail tools. Our mail guide covers sending, collecting and the costs.
  • Keep an eye on Postal's add-on page, which shows our latest check.

More for traders: gold-making add-ons.