diff -r 80628d4069be hgext/convert/__init__.py
--- a/hgext/convert/__init__.py	Fri Jan 31 01:12:35 2014 -0800
+++ b/hgext/convert/__init__.py	Thu Feb 13 19:14:32 2014 +1100
@@ -85,6 +85,9 @@
 
     Empty lines and lines starting with a ``#`` are ignored.
 
+    The authormapsuffix can be used to append set text to each
+    post-authormap-translated author name.
+
     The filemap is a file that allows filtering and remapping of files
     and directories. Each line can contain one of the following
     directives::
@@ -321,6 +324,8 @@
            _('import up to source revision REV'), _('REV')),
           ('A', 'authormap', '',
            _('remap usernames using this file'), _('FILE')),
+          ('', 'authormapsuffix', '',
+           _('append this suffix to remapped author names'), _('SUFFIX')),
           ('', 'filemap', '',
            _('remap file names using contents of file'), _('FILE')),
           ('', 'splicemap', '',
diff -r 80628d4069be hgext/convert/convcmd.py
--- a/hgext/convert/convcmd.py	Fri Jan 31 01:12:35 2014 -0800
+++ b/hgext/convert/convcmd.py	Thu Feb 13 19:14:32 2014 +1100
@@ -103,12 +103,15 @@
         self.commitcache = {}
         self.authors = {}
         self.authorfile = None
+        self.authormapsuffix = ''
 
         # Record converted revisions persistently: maps source revision
         # ID to target revision ID (both strings).  (This is how
         # incremental conversions work.)
         self.map = mapfile(ui, revmapfile)
 
+        if opts.get('authormapsuffix'):
+            self.authormapsuffix = opts.get('authormapsuffix')
         # Read first the dst author map if any
         authorfile = self.dest.authorfile()
         if authorfile and os.path.exists(authorfile):
@@ -393,7 +396,7 @@
                 continue
 
             srcauthor = srcauthor.strip()
-            dstauthor = dstauthor.strip()
+            dstauthor = dstauthor.strip() + self.authormapsuffix
             if self.authors.get(srcauthor) in (None, dstauthor):
                 msg = _('mapping author %s to %s\n')
                 self.ui.debug(msg % (srcauthor, dstauthor))
@@ -407,7 +410,8 @@
 
     def cachecommit(self, rev):
         commit = self.source.getcommit(rev)
-        commit.author = self.authors.get(commit.author, commit.author)
+        commit.author = self.authors.get(commit.author,
+                                         commit.author + self.authormapsuffix)
         # If commit.branch is None, this commit is coming from the source
         # repository's default branch and destined for the default branch in the
         # destination repository. For such commits, passing a literal "None"
diff -r 80628d4069be tests/test-convert-authormap.t
--- a/tests/test-convert-authormap.t	Fri Jan 31 01:12:35 2014 -0800
+++ b/tests/test-convert-authormap.t	Thu Feb 13 19:14:32 2014 +1100
@@ -10,6 +10,8 @@
   $ cd orig
   $ echo foo > foo
   $ HGUSER='user name' hg ci -qAm 'foo'
+  $ echo bar > bar
+  $ HGUSER='user name 2' hg ci -qAm 'bar'
   $ cd ..
 
 Explicit --authors
@@ -26,13 +28,19 @@
   scanning source...
   sorting...
   converting...
-  0 foo
+  1 foo
+  0 bar
   writing author map file $TESTTMP/new/.hg/authormap (glob)
   $ cat new/.hg/authormap
   user name=Long User Name
   $ hg -Rnew log
+  changeset:   1:263e7765e4b7
+  tag:         tip
+  user:        user name 2
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     bar
+  
   changeset:   0:d89716e88087
-  tag:         tip
   user:        Long User Name
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     foo
@@ -48,11 +56,72 @@
   scanning source...
   sorting...
   converting...
-  0 foo
+  1 foo
+  0 bar
   $ hg -Rnew log
+  changeset:   1:263e7765e4b7
+  tag:         tip
+  user:        user name 2
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     bar
+  
   changeset:   0:d89716e88087
-  tag:         tip
   user:        Long User Name
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     foo
   
+  $ rm -rf new
+
+Use authormapsuffix together with authormap
+
+  $ cat > authormap.txt <<EOF
+  > user name = username
+  > user name 2 = username2
+  > EOF
+  $ hg convert --authormap authormap.txt --authormapsuffix '@test.org' orig new
+  initializing destination new repository
+  scanning source...
+  sorting...
+  converting...
+  1 foo
+  0 bar
+  writing author map file $TESTTMP/new/.hg/authormap
+  $ cat new/.hg/authormap
+  user name 2=username2@test.org
+  user name=username@test.org
+  $ hg -Rnew log
+  changeset:   1:aeeaab422b32
+  tag:         tip
+  user:        username2@test.org
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     bar
+  
+  changeset:   0:51317d63da9e
+  user:        username@test.org
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     foo
+  
+  $ rm -rf new
+
+Use authormapsuffix stand alone
+
+  $ hg convert --authormapsuffix '@test.org' orig new
+  initializing destination new repository
+  scanning source...
+  sorting...
+  converting...
+  1 foo
+  0 bar
+  $ hg -Rnew log
+  changeset:   1:94e0dcfe3b0d
+  tag:         tip
+  user:        user name 2@test.org
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     bar
+  
+  changeset:   0:e2ff155c86b8
+  user:        user name@test.org
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     foo
+  
+