Create: Envelope compat

Create packages carry Envelope addresses natively. A Create packager can pack items addressed through a slap Address Tag, and the package is routed alongside Envelope mail. Incoming pre-addressed packages are caught at the packager and delivered to the mailbox as a whole. Addresses sync in both directions, so an address set on one side is recognized by the other.

Packaged items can also flow from Create machinery into Envelope's mail system without intermediate chests. Freshly packed packages can be moved from a crate into a mailbox ahead of a frogport, and items placed in the SLOT MAIL are readied for pigeon dispatch. Received mail and returned packages can be extracted from the inbox, and a loop of a packager, a Mailbox Pigeon Recipient, a Lost Mail Return Funnel and a Back Packager keeps the flow closed.

The mod suits factory setups that rely on mechanical arms, funnels and factory gauges to move goods, paired with Envelope's pigeon delivery and addressing. Payback packages stay in their own format so the mail service still recognizes the payment. Installation requires Envelope and Create on NeoForge for 1.21.1. The mod runs on client and server, so the server and every player need it, and it is published under the GNU General Public License v3.0 only, with the source code public.