diff --git a/src/config.js b/src/config.js
index 5e83950..1f835e3 100644
--- a/src/config.js
+++ b/src/config.js
@@ -60,6 +60,7 @@ for (const [prop, value] of Object.entries(userConfig)) {
   finalConfig[prop] = value;
 }
 
+// Default knex config
 if (! finalConfig['knex']) {
   finalConfig['knex'] = {
     client: 'sqlite',
@@ -70,12 +71,14 @@ if (! finalConfig['knex']) {
   };
 }
 
+// Make sure migration settings are always present in knex config
 Object.assign(finalConfig['knex'], {
   migrations: {
     directory: path.join(finalConfig.dbDir, 'migrations')
   }
 });
 
+// Make sure all of the required config options are present
 for (const opt of required) {
   if (! finalConfig[opt]) {
     console.error(`Missing required config.json value: ${opt}`);
@@ -83,4 +86,9 @@ for (const opt of required) {
   }
 }
 
+// Make sure mainGuildId is internally always an array
+if (! Array.isArray(finalConfig['mainGuildId'])) {
+  finalConfig['mainGuildId'] = [finalConfig['mainGuildId']];
+}
+
 module.exports = finalConfig;
diff --git a/src/data/threads.js b/src/data/threads.js
index ee72817..0b8883b 100644
--- a/src/data/threads.js
+++ b/src/data/threads.js
@@ -4,7 +4,6 @@ const moment = require('moment');
 const uuid = require('uuid');
 const humanizeDuration = require('humanize-duration');
 
-const bot = require('../bot');
 const knex = require('../knex');
 const config = require('../config');
 const utils = require('../utils');
@@ -37,6 +36,13 @@ async function findOpenThreadByUserId(userId) {
   return (thread ? new Thread(thread) : null);
 }
 
+function getHeaderGuildInfo(member) {
+  return {
+    nickname: member.nick || member.user.username,
+    joinDate: humanizeDuration(Date.now() - member.joinedAt, {largest: 2, round: true})
+  };
+}
+
 /**
  * Creates a new modmail thread for the specified user
  * @param {Eris.User} user
@@ -96,20 +102,45 @@ async function createNewThreadForUser(user, quiet = false) {
   }
 
   // Post some info to the beginning of the new thread
-  const mainGuild = utils.getMainGuild();
-  const member = (mainGuild ? mainGuild.members.get(user.id) : null);
-  if (! member) console.log(`[INFO] Member ${user.id} not found in main guild ${config.mainGuildId}`);
+  const infoHeaderItems = [];
 
-  let mainGuildNickname = null;
-  if (member && member.nick) mainGuildNickname = member.nick;
-  else if (member && member.user) mainGuildNickname = member.user.username;
-  else if (member == null) mainGuildNickname = 'NOT ON SERVER';
+  // Account age
+  const accountAge = humanizeDuration(Date.now() - user.createdAt, {largest: 2, round: true});
+  infoHeaderItems.push(`ACCOUNT AGE **${accountAge}**`);
 
-  if (mainGuildNickname == null) mainGuildNickname = 'UNKNOWN';
+  // User id
+  infoHeaderItems.push(`ID **${user.id}**`);
+
+  let infoHeader = infoHeaderItems.join(', ');
+
+  // Guild info
+  const guildInfoHeaderItems = new Map();
+
+  utils.getMainGuilds().forEach(guild => {
+    const member = guild.members.get(user.id);
+    if (! member) return;
+
+    const {nickname, joinDate} = getHeaderGuildInfo(member);
+    guildInfoHeaderItems.set(guild.name, [
+      `NICKNAME **${nickname}**`,
+      `JOINED **${joinDate}** ago`
+    ]);
+  });
+
+  guildInfoHeaderItems.forEach((items, guildName) => {
+    if (guildInfoHeaderItems.size === 1) {
+      infoHeader += `\n${items.join(', ')}`;
+    } else {
+      infoHeader += `\n**[${guildName}]** ${items.join(', ')}`;
+    }
+  });
 
   const userLogCount = await getClosedThreadCountByUserId(user.id);
-  const accountAge = humanizeDuration(Date.now() - user.createdAt, {largest: 2});
-  const infoHeader = `ACCOUNT AGE **${accountAge}**, ID **${user.id}**, NICKNAME **${mainGuildNickname}**, LOGS **${userLogCount}**\n-------------------------------`;
+  if (userLogCount > 0) {
+    infoHeader += `\n\nThis user has **${userLogCount}** previous modmail threads. Use \`${config.prefix}logs\` to see them.`;
+  }
+
+  infoHeader += '\n────────────────';
 
   await newThread.postSystemMessage(infoHeader);
 
diff --git a/src/utils.js b/src/utils.js
index 8177a5b..8ab6e8a 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -7,10 +7,10 @@ const config = require('./config');
 
 class BotError extends Error {}
 
-const userMentionRegex = /^<@\!?([0-9]+?)>$/;
+const userMentionRegex = /^<@!?([0-9]+?)>$/;
 
 let inboxGuild = null;
-let mainGuild = null;
+let mainGuilds = [];
 let logChannel = null;
 
 /**
@@ -23,17 +23,26 @@ function getInboxGuild() {
 }
 
 /**
- * @returns {Eris~Guild}
+ * @returns {Eris~Guild[]}
  */
-function getMainGuild() {
-  if (! mainGuild) mainGuild = bot.guilds.find(g => g.id === config.mainGuildId);
-  if (! mainGuild) console.warn('[WARN] The bot is not on the main server! If this is intentional, you can ignore this warning.');
-  return mainGuild;
+function getMainGuilds() {
+  if (mainGuilds.length === 0) {
+    mainGuilds = bot.guilds.filter(g => config.mainGuildId.includes(g.id));
+  }
+
+  if (mainGuilds.length !== config.mainGuildId.length) {
+    if (config.mainGuildId.length === 1) {
+      console.warn(`[WARN] The bot hasn't joined the main guild!`);
+    } else {
+      console.warn(`[WARN] The bot hasn't joined one or more main guilds!`);
+    }
+  }
+
+  return mainGuilds;
 }
 
 /**
  * Returns the designated log channel, or the default channel if none is set
- * @param bot
  * @returns {Eris~TextChannel}
  */
 function getLogChannel() {
@@ -91,8 +100,9 @@ function messageIsOnInboxServer(msg) {
  */
 function messageIsOnMainServer(msg) {
   if (! msg.channel.guild) return false;
-  if (msg.channel.guild.id !== getMainGuild().id) return false;
-  return true;
+
+  return getMainGuilds()
+    .some(g => msg.channel.guild.id === g.id);
 }
 
 /**
@@ -268,7 +278,7 @@ module.exports = {
   BotError,
 
   getInboxGuild,
-  getMainGuild,
+  getMainGuilds,
   getLogChannel,
   postError,
   postLog,