Configurable message size limit. Defaults to 14MB. (#383)

config/postal.defaults.yml

@@ -71,6 +71,7 @@ smtp_server:
   proxy_protocol: false
   log_connect: true
   strip_received_headers: false
+  max_message_size: 14 # size in Megabytes
 smtp_relays:
   -

lib/postal/message_db/provisioner.rb

@@ -82,7 +82,7 @@ module Postal
         begin
           @database.query(create_table_query(table,:columns => {
               :id   =>  'int(11) NOT NULL AUTO_INCREMENT',
-              :data =>  'mediumblob DEFAULT NULL',
+              :data =>  'longblob DEFAULT NULL',
               :next =>  'int(11) DEFAULT NULL'
             }
           ))

lib/postal/smtp_server/client.rb

@@ -377,8 +377,8 @@ module Postal
       end
       def finished
-        if @data.bytesize > 14.megabytes.to_i
-          return "552 Message too large (maximum size 14MB)"
+        if @data.bytesize > Postal.config.smtp_server.max_message_size.megabytes.to_i
+          return "552 Message too large (maximum size %dMB)" % Postal.config.smtp_server.max_message_size
         end
         if @headers['received'].select { |r| r =~ /by #{Postal.config.dns.smtp_server_hostname}/ }.count > 4