Add priority field to server

app/controllers/servers_controller.rb

@@ -96,7 +96,7 @@ def unsuspend
   private
 
   def safe_params(*extras)
-    params.require(:server).permit(:name, :mode, :ip_pool_id, *extras)
+    params.require(:server).permit(:name, :mode, :priority, :ip_pool_id, *extras)
   end
 
 end

app/lib/worker/jobs/process_queued_messages_job.rb

@@ -40,12 +40,16 @@ def local_ip?(ip)
       end
 
       # Obtain a queued message from the database for processing
+      # Messages are prioritized based on the server's priority (higher priority first)
+      # and then by the message ID (ascending order).
       #
       # @return [void]
       def lock_message_for_processing
-        QueuedMessage.where(ip_address_id: [nil, @ip_addresses])
+        QueuedMessage.joins(:server)
+                     .where(ip_address_id: [nil, @ip_addresses])
                      .where(locked_by: nil, locked_at: nil)
                      .ready_with_delayed_retry
+                     .order("servers.priority DESC, queued_messages.id ASC")
                      .limit(1)
                      .update_all(locked_by: @locker, locked_at: @lock_time)
       end

app/models/server.rb

@@ -78,7 +78,12 @@ class Server < ApplicationRecord
   validates :mode, inclusion: { in: MODES }
   validates :permalink, presence: true, uniqueness: { scope: :organization_id, case_sensitive: false }, format: { with: /\A[a-z0-9-]*\z/ }, exclusion: { in: RESERVED_PERMALINKS }
   validate :validate_ip_pool_belongs_to_organization
-
+  validates :priority, presence: true, numericality: {
+    only_integer: true,
+    greater_than_or_equal_to: 0,
+    less_than_or_equal_to: 32767,
+    message: "must be a whole number between 0 and 32,767"
+  }
   before_validation(on: :create) do
     self.token = token.downcase if token
   end

app/views/servers/_form.html.haml

@@ -20,6 +20,15 @@
           e-mail will be routed normally to the intended recipients. When in <b>Development</b> mode,
           outgoing & incoming mail will be held and only visible in the web interface and will not be
           sent to any recipients or HTTP endpoints.
+    .fieldSet__field
+      = f.label :priority, "Sending Priority", :class => 'fieldSet__label'
+      .fieldSet__input
+        = f.text_field :priority,
+                       :class => 'input input--text',
+                       :placeholder => "e.g. 10"
+        %p.fieldSet__text
+          Set a priority for this server's outgoing mail. Messages from servers with a higher number will be sent first.
+          The default is <b>0</b>.
 
     - if Postal.ip_pools?
       .fieldSet__field

db/migrate/20250915065902_add_priority_to_server.rb

@@ -0,0 +1,5 @@
+class AddPriorityToServer < ActiveRecord::Migration[7.0]
+  def change
+    add_column :servers, :priority, :integer, limit: 2, unsigned: true, default: 0
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2024_03_11_205229) do
+ActiveRecord::Schema[7.0].define(version: 2025_09_15_065902) do
   create_table "additional_route_endpoints", id: :integer, charset: "utf8mb4", collation: "utf8mb4_general_ci", force: :cascade do |t|
     t.integer "route_id"
     t.string "endpoint_type"
@@ -255,6 +255,7 @@
     t.index ["permalink"], name: "index_servers_on_permalink", length: 6
     t.index ["token"], name: "index_servers_on_token", length: 6
     t.index ["uuid"], name: "index_servers_on_uuid", length: 8
+    t.integer "priority", limit: 2, default: 0, unsigned: true
   end
 
   create_table "smtp_endpoints", id: :integer, charset: "utf8mb4", collation: "utf8mb4_general_ci", force: :cascade do |t|