--- bzr-fastimport-0.13.0/user_mapper.py~	2013-01-19 14:01:00.135642260 +0200
+++ bzr-fastimport-0.13.0/user_mapper.py	2013-01-19 14:01:47.191146251 +0200
@@ -43,16 +44,16 @@
             line = line.strip()
             if len(line) == 0 or line.startswith('#'):
                 continue
-            old, new = line.split('=', 1)
-            old = old.strip()
-            new = new.strip()
+
+            old = "=".join(line.split('=')[:-1]).strip()
+            new = "=".join(line.split('=')[-1:]).strip()
             if old == '@':
                 self._default_domain = new
                 continue
             # Parse each id into a name and email address
             old_name, old_email = self._parse_id(old)
             new_name, new_email = self._parse_id(new)
-            #print "found user map: %s => %s" % ((old_name, old_email), (new_name, new_email))
+            #print >> sys.stderr, "found user map: %s => %s" % ((old_name, old_email), (new_name, new_email))
             self._user_map[(old_name, old_email)] = (new_name, new_email)
 
     def _parse_id(self, id):