diff --git a/README.md b/README.md
index 26eb1f3..49f6f92 100644
--- a/README.md
+++ b/README.md
@@ -79,6 +79,7 @@ These go in `config.json`. See also `config.example.json`.
 |enableGreeting|false|Set to true to send a welcome message to new main guild members. Requires `mainGuildId` to be set.|
 |greetingAttachment|None|Path to an image or other attachment to send along with the greeting|
 |greetingMessage|None|Text content of the welcome message|
+|guildGreetings|None|When using multiple mainGuildIds, this option allows you to configure greetings on a per-server basis. The syntax is an object with the guild ID as the key, and another object with `message` and `attachment` properties as the value (identical to greetingMessage and greetingAttachment)|
 |ignoreAccidentalThreads|false|If set to true, the bot attempts to ignore common "accidental" messages that would start a new thread, such as "ok", "thanks", etc.|
 |inboxServerPermission|None|Permission required to use bot commands on the inbox server|
 |timeOnServerDeniedMessage|"You haven't been a member of the server for long enough to contact modmail."|See `requiredTimeOnServer` below|
diff --git a/src/config.js b/src/config.js
index 8eb54d4..9fac326 100644
--- a/src/config.js
+++ b/src/config.js
@@ -75,6 +75,8 @@ const defaultConfig = {
   "greetingMessage": null,
   "greetingAttachment": null,
 
+  "guildGreetings": {},
+
   "requiredAccountAge": null, // In hours
   "accountAgeDeniedMessage": "Your Discord account is not old enough to contact modmail.",
 
@@ -160,6 +162,20 @@ if (! Array.isArray(finalConfig['inboxServerPermission'])) {
   }
 }
 
+// Move greetingMessage/greetingAttachment to the guildGreetings object internally
+// Or, in other words, if greetingMessage and/or greetingAttachment is set, it is applied for all servers that don't
+// already have something set up in guildGreetings. This retains backwards compatibility while allowing you to override
+// greetings for specific servers in guildGreetings.
+if (finalConfig.greetingMessage || finalConfig.greetingAttachment) {
+  for (const guildId of finalConfig.mainGuildId) {
+    if (finalConfig.guildGreetings[guildId]) continue;
+    finalConfig.guildGreetings[guildId] = {
+      message: finalConfig.greetingMessage,
+      message: finalConfig.greetingMessage
+    };
+  }
+}
+
 // newThreadCategoryId is syntactic sugar for categoryAutomation.newThread
 if (finalConfig.newThreadCategoryId) {
   finalConfig.categoryAutomation.newThread = finalConfig.newThreadCategoryId;
diff --git a/src/main.js b/src/main.js
index 65667cd..617a73e 100644
--- a/src/main.js
+++ b/src/main.js
@@ -107,7 +107,7 @@ bot.on('messageUpdate', async (msg, oldMessage) => {
   if (msg.channel instanceof Eris.PrivateChannel) {
     const thread = await threads.findOpenThreadByUserId(msg.author.id);
     if (! thread) return;
-    
+
     const editMessage = utils.disableLinkPreviews(`**The user edited their message:**\n\`B:\` ${oldContent}\n\`A:\` ${newContent}`);
     thread.postSystemMessage(editMessage);
   }
diff --git a/src/modules/greeting.js b/src/modules/greeting.js
index 557fd44..6371638 100644
--- a/src/modules/greeting.js
+++ b/src/modules/greeting.js
@@ -5,16 +5,15 @@ const config = require('../config');
 module.exports = bot => {
   if (! config.enableGreeting) return;
 
-  const greetingGuilds = config.mainGuildId;
-
   bot.on('guildMemberAdd', (guild, member) => {
-    if (! greetingGuilds.includes(guild.id)) return;
+    const guildGreeting = config.guildGreetings[guild.id];
+    if (! guildGreeting || (! guildGreeting.message && ! guildGreeting.attachment)) return;
 
-    function sendGreeting(file) {
+    function sendGreeting(message, file) {
       bot.getDMChannel(member.id).then(channel => {
         if (! channel) return;
 
-        channel.createMessage(config.greetingMessage || '', file)
+        channel.createMessage(message || '', file)
           .catch(e => {
             if (e.code === 50007) return;
             throw e;
@@ -22,14 +21,14 @@ module.exports = bot => {
       });
     }
 
-    if (config.greetingAttachment) {
-      const filename = path.basename(config.greetingAttachment);
-      fs.readFile(config.greetingAttachment, (err, data) => {
+    if (guildGreeting.attachment) {
+      const filename = path.basename(guildGreeting.attachment);
+      fs.readFile(guildGreeting.attachment, (err, data) => {
         const file = {file: data, name: filename};
-        sendGreeting(file);
+        sendGreeting(guildGreeting.message, file);
       });
     } else {
-      sendGreeting();
+      sendGreeting(guildGreeting.message);
     }
   });
 };