I'm running roundup 0.7.3 with postgresql backend.
After setting up the mail-gw, an exception has been
thrown periodically and with the default setting of
MAIL_DEFAULT_CLASS (issue) it created some 700 issues
with the following message:

Traceback (most recent call last):
  File "/usr/bin/roundup-mailgw", line 3, in ?
    run()
  File
"/usr/lib/python2.3/site-packages/roundup/scripts/roundup_mailgw.py",
line 184, in run
    sys.exit(main(sys.argv))
  File
"/usr/lib/python2.3/site-packages/roundup/scripts/roundup_mailgw.py",
line 177, in main
    db.close()
  File
"/usr/lib/python2.3/site-packages/roundup/backends/rdbms_common.py",
line 1168, in close
    self.sql_close()
  File
"/usr/lib/python2.3/site-packages/roundup/backends/rdbms_common.py",
line 1162, in sql_close
    self.conn.close()
psycopg.InterfaceError: already closed