diff --git a/plugins/NickAuth/plugin.py b/plugins/NickAuth/plugin.py
index c84d56b35..b8116dbc6 100644
--- a/plugins/NickAuth/plugin.py
+++ b/plugins/NickAuth/plugin.py
@@ -147,6 +147,13 @@ class NickAuth(callbacks.Plugin):
         irc.queueMsg(ircmsgs.whois(nick, nick))
     auth = wrap(auth, [])
 
+    def inFilter(self, irc, msg):
+        """If the messages has a server tag with account name, tries to
+        authenticate it."""
+        if msg.server_tags and 'account' in msg.server_tags:
+            self._auth(irc, msg.prefix, msg.server_tags['account'])
+        return msg
+
     def do330(self, irc, msg):
         mynick, theirnick, theiraccount, garbage = msg.args
         # I would like to use a dict comprehension, but we have to support
@@ -176,18 +183,8 @@ class NickAuth(callbacks.Plugin):
         account = msg.args[0]
         user = ircdb.users.getUserFromNick(irc.network, account)
 
-        if not user:
-            try:
-                user = ircdb.users.getUser(msg.prefix)
-            except KeyError:
-                user = None
-
-        if user:
-            if account == '*':
-                user.clearAuth()
-            else:
-                user.addAuth(msg.prefix)
-                ircdb.users.setUser(user, flush=False)
+        if account != '*':
+            self._auth(irc, msg.prefix, account)
 
 
     def doJoin(self, irc, msg):
@@ -196,18 +193,8 @@ class NickAuth(callbacks.Plugin):
             return
 
         account = msg.args[1]
-        user = ircdb.users.getUserFromNick(irc.network, account)
-
-        if not user:
-            try:
-                user = ircdb.users.getUser(msg.prefix)
-            except KeyError:
-                user = None
-
-        if user:
-            if account != '*':
-                user.addAuth(msg.prefix)
-                ircdb.users.setUser(user, flush=False)
+        if account != '*':
+            self._auth(irc, msg.prefix, account)
 
     def do354(self, irc, msg):
         if len(msg.args) != 6 or msg.args[1] != '1':
@@ -217,6 +204,12 @@ class NickAuth(callbacks.Plugin):
         prefix = '%s!%s@%s' % (nick, ident, host)
         user = ircdb.users.getUserFromNick(irc.network, account)
 
+        if account != '0':
+            self._auth(irc, prefix, account)
+
+    def _auth(self, irc, prefix, account):
+        user = ircdb.users.getUserFromNick(irc.network, account)
+
         if not user:
             try:
                 user = ircdb.users.getUser(prefix)
@@ -224,7 +217,6 @@ class NickAuth(callbacks.Plugin):
                 user = None
 
         if user:
-            if account != '0':
                 user.addAuth(prefix)
                 ircdb.users.setUser(user, flush=False)
 
diff --git a/src/irclib.py b/src/irclib.py
index eafbcf755..ee122084c 100644
--- a/src/irclib.py
+++ b/src/irclib.py
@@ -967,7 +967,7 @@ class Irc(IrcCommandDispatcher):
             self.sasl = 'plain'
 
         for cap in ('account-notify', 'extended-join', 'multi-prefix',
-                'metadata-notify'):
+                'metadata-notify', 'account-tag'):
             self.queueMsg(ircmsgs.IrcMsg(command='CAP', args=('REQ', cap)))
 
         if self.sasl:
diff --git a/test/test_irclib.py b/test/test_irclib.py
index bb85f33fa..034ec725c 100644
--- a/test/test_irclib.py
+++ b/test/test_irclib.py
@@ -391,6 +391,10 @@ class IrcTestCase(SupyTestCase):
         m = self.irc.takeMsg()
         self.failUnless(m.command == 'CAP', 'Expected CAP, got %r.' % m)
         m = self.irc.takeMsg()
+        self.failUnless(m.command == 'CAP', 'Expected CAP, got %r.' % m)
+        m = self.irc.takeMsg()
+        self.failUnless(m.command == 'CAP', 'Expected CAP, got %r.' % m)
+        m = self.irc.takeMsg()
         self.failUnless(m.command == 'USER', 'Expected USER, got %r.' % m)
 
     def testPingResponse(self):
@@ -492,6 +496,8 @@ class IrcCallbackTestCase(SupyTestCase):
                 ircmsgs.IrcMsg(command='CAP', args=('REQ', 'account-notify')),
                 ircmsgs.IrcMsg(command='CAP', args=('REQ', 'extended-join')),
                 ircmsgs.IrcMsg(command='CAP', args=('REQ', 'multi-prefix')),
+                ircmsgs.IrcMsg(command='CAP', args=('REQ', 'metadata-notify')),
+                ircmsgs.IrcMsg(command='CAP', args=('REQ', 'account-tag')),
                 ircmsgs.IrcMsg(command='CAP', args=('END',)),
                 ircmsgs.user('limnoria', user)
             ]