Test with stuff + Forestry potential support

BM_src/forestry/api/mail/IPostRegistry.java

@@ -0,0 +1,47 @@
+package forestry.api.mail;
+
+import java.util.Map;
+
+import net.minecraft.item.ItemStack;
+import net.minecraft.world.World;
+
+public interface IPostRegistry {
+	
+	/* POST OFFICE */
+	IPostOffice getPostOffice(World world);
+
+	/* LETTERS */
+	boolean isLetter(ItemStack itemstack);
+
+	ILetter createLetter(MailAddress sender, MailAddress recipient);
+	
+	ILetter getLetter(ItemStack itemstack);
+	
+	ItemStack createLetterStack(ILetter letter);
+	
+	/* CARRIERS */
+	/**
+	 * Registers a new {@link IPostalCarrier}. See {@link IPostalCarrier} for details.
+	 * @param carrier {@link IPostalCarrier} to register.
+	 */
+	void registerCarrier(IPostalCarrier carrier);
+	
+	IPostalCarrier getCarrier(String uid);
+
+	Map<String, IPostalCarrier> getRegisteredCarriers();
+
+	/* TRADE STATIONS */
+	void deleteTradeStation(World world, String moniker);
+
+	ITradeStation getOrCreateTradeStation(World world, String owner, String moniker);
+
+	ITradeStation getTradeStation(World world, String moniker);
+
+	boolean isAvailableTradeMoniker(World world, String moniker);
+
+	boolean isValidTradeMoniker(World world, String moniker);
+
+	/* PO BOXES */
+	boolean isValidPOBox(World world, String username);
+
+}