diff --git a/README.md b/README.md
index b177a4f..a6eaeae 100644
--- a/README.md
+++ b/README.md
@@ -93,6 +93,7 @@ Valid JSON cannot contain comments, so remember to remove them first!
     // Prevent messages posted by Slackbot (e.g. Slackbot responses)
     // from being posted into the IRC channel:
     "muteSlackbot": true, // Off by default
+    "muteBridgedUsers": false, // On by default
     // Sends messages to Slack whenever a user joins/leaves an IRC channel:
     "ircStatusNotices": {
       "join": false, // Don't send messages about joins
diff --git a/lib/bot.js b/lib/bot.js
index f5f8276..e5c649b 100644
--- a/lib/bot.js
+++ b/lib/bot.js
@@ -35,6 +35,7 @@ class Bot {
     this.commandCharacters = options.commandCharacters || [];
     this.channels = _.values(options.channelMapping);
     this.muteSlackbot = options.muteSlackbot || false;
+    this.muteBridgedUsers = options.muteBridgedUsers;
     this.muteUsers = {
       slack: [],
       irc: [],
@@ -100,10 +101,13 @@ class Bot {
     });
 
     this.slack.rtm.on('message', (message) => {
-      // Ignore bot messages and people leaving/joining
-      if (message.type === 'message' &&
-        (!message.subtype || ALLOWED_SUBTYPES.indexOf(message.subtype) > -1)) {
-        this.sendToIRC(message);
+        // Ignore bot messages and people leaving/joining
+      if (message.type === 'message') {
+        if (!message.subtype || ALLOWED_SUBTYPES.indexOf(message.subtype) > -1) {
+          this.sendToIRC(message);
+        } else if (message.subtype === 'bot_message' && message.username) {
+          this.sendToIRC(message);
+        }
       }
     });
 
@@ -202,11 +206,21 @@ class Bot {
 
     const user = dataStore.getUserById(message.user);
 
-    if (this.muteUsers.slack.indexOf(user.name) !== -1) {
+    if (user && this.muteUsers.slack.indexOf(user.name) !== -1) {
       logger.debug(`Muted message from Slack ${user.name}: ${message.text}`);
       return;
     }
 
+    if (message.subtype === 'bot_message') {
+      if (message.username && message.username.search(/[(]IRC[)]/) !== -1) {
+        logger.debug(`Muted self-generated message ${message.username}: ${message.text}`);
+        return;
+      } else if (this.muteBridgedUsers === true) {
+        logger.debug(`Muted message from a bridged user ${message.username}: ${message.text} ${this.muteBridgedUsers} ${message.subtype}`);
+        return;
+      }
+    }
+
     const channelName = channel.is_channel ? `#${channel.name}` : channel.name;
     const ircChannel = this.channelMapping[channelName];
 
@@ -219,6 +233,8 @@ class Bot {
         this.ircClient.say(ircChannel, prelude);
       } else if (!message.subtype) {
         text = `<${user.name}> ${text}`;
+      } else if (message.subtype === 'bot_message') {
+        text = `<${message.username}> ${text}`;
       } else if (message.subtype === 'file_share') {
         text = `<${user.name}> File uploaded ${message.file.permalink} / ${message.file.permalink_public}`;
         if (message.file.initial_comment) {
@@ -228,7 +244,12 @@ class Bot {
         text = `Action: ${user.name} ${text}`;
       }
       logger.debug('Sending message to IRC', channelName, text);
-      this.ircClient.say(ircChannel, text);
+
+      while (text.length > 0) {
+        const msg = text.substring(0, 510);
+        text = text.substr(510);
+        this.ircClient.say(ircChannel, msg);
+      }
     }
   }
 
diff --git a/test/bot-events.test.js b/test/bot-events.test.js
index 6302c26..cf76ae0 100644
--- a/test/bot-events.test.js
+++ b/test/bot-events.test.js
@@ -107,6 +107,29 @@ describe('Bot Events', function () {
     this.bot.sendToIRC.should.have.not.have.been.called;
   });
 
+  it('should not send bot messages without usernames to irc', function () {
+    const message = {
+      type: 'message',
+      subtype: 'bot_message',
+      text: 'a message from a bot',
+      bot_id: 'ROBOT'
+    };
+    this.bot.slack.rtm.emit('message', message);
+    this.bot.sendToIRC.should.have.not.have.been.called;
+  });
+
+  it('should send bot messages with usernames to irc', function () {
+    const message = {
+      type: 'message',
+      subtype: 'bot_message',
+      text: 'a message from a user',
+      username: 'realuser',
+      bot_id: 'ROBOT'
+    };
+    this.bot.slack.rtm.emit('message', message);
+    this.bot.sendToIRC.should.have.have.been.called;
+  });
+
   it('should send messages to slack', function () {
     const channel = '#channel';
     const author = 'user';
diff --git a/test/bot.test.js b/test/bot.test.js
index 0234d4a..bcec8e4 100644
--- a/test/bot.test.js
+++ b/test/bot.test.js
@@ -310,6 +310,32 @@ describe('Bot', function () {
     ClientStub.prototype.say.should.not.have.been.called;
   });
 
+  it('should not send messages from bots with usernames if bridged user muting is on', function () {
+    this.bot.muteBridgedUsers = true;
+    const message = {
+      type: 'message',
+      subtype: 'bot_message',
+      bot_id: 'SOMEBOT',
+      username: 'someuser',
+      text: 'hello world!'
+    };
+    this.bot.sendToIRC(message);
+    ClientStub.prototype.say.should.not.have.been.called;
+  });
+
+  it('should send bot messages with usernames to irc', function () {
+    this.bot.muteBridgedUsers = false;
+    const message = {
+      type: 'message',
+      subtype: 'bot_message',
+      bot_id: 'SOMEBOT',
+      username: 'someuser',
+      text: 'hello world!'
+    };
+    this.bot.sendToIRC(message);
+    ClientStub.prototype.say.should.have.been.called;
+  });
+
   it('should parse text from slack when sending messages', function () {
     const text = '<@USOMEID> <@USOMEID|readable>';
     const message = {