# Buggy code
def fetch(self, start=None, stop=None, **kwargs):
    emails = []
    for qm in self.messages[start - 1 : stop]:
        m = {
            "from": qm["mail__from_addr"],
            "to": qm["mail__msgrcpt__rid__email"],
            "subject": qm["mail__subject"],
            "mailid": qm["mail__mail_id"],
            "date": qm["mail__time_num"],
            "type": qm["mail__msgrcpt__content"],
            "score": qm["mail__msgrcpt__bspam_level"],
        }
        rs = qm["mail__msgrcpt__rs"]
        if rs == "":
            m["class"] = "unseen"
        elif rs == "R":
            m["img_rstatus"] = static_url("pics/release.png")
        elif rs == "p":
            m["class"] = "pending"
        emails.append(m)
    return emails


# Traceback (IntegrityError)
Internal Server Error: /quarantine/process/
Traceback (most recent call last):
File "/srv/modoboa/python-virtualenv-modoboa-1.1.1/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 115, in get_response
response = callback(request, *callback_args, **callback_kwargs)
File "/srv/modoboa/python-virtualenv-modoboa-1.1.1/local/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 25, in _wrapped_view
return view_func(request, *args, **kwargs)
File "/srv/modoboa/python-virtualenv-modoboa-1.1.1/local/lib/python2.7/site-packages/modoboa/extensions/amavis/views.py", line 307, in process
return release(request, ids)
File "/srv/modoboa/python-virtualenv-modoboa-1.1.1/local/lib/python2.7/site-packages/modoboa/extensions/amavis/lib.py", line 30, in wrapped_f
return f(request, *args, **kwargs)
File "/srv/modoboa/python-virtualenv-modoboa-1.1.1/local/lib/python2.7/site-packages/modoboa/extensions/amavis/views.py", line 282, in release
rcpt.save()
File "/srv/modoboa/python-virtualenv-modoboa-1.1.1/local/lib/python2.7/site-packages/django/db/models/base.py", line 546, in save
force_update=force_update, update_fields=update_fields)
File "/srv/modoboa/python-virtualenv-modoboa-1.1.1/local/lib/python2.7/site-packages/django/db/models/base.py", line 626, in save_base
rows = manager.using(using).filter(pk=pk_val)._update(values)
File "/srv/modoboa/python-virtualenv-modoboa-1.1.1/local/lib/python2.7/site-packages/django/db/models/query.py", line 605, in _update
return query.get_compiler(self.db).execute_sql(None)
File "/srv/modoboa/python-virtualenv-modoboa-1.1.1/local/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 1020, in execute_sql
cursor = super(SQLUpdateCompiler, self).execute_sql(result_type)
File "/srv/modoboa/python-virtualenv-modoboa-1.1.1/local/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 846, in execute_sql
cursor.execute(sql, params)
File "/srv/modoboa/python-virtualenv-modoboa-1.1.1/local/lib/python2.7/site-packages/django/db/backends/util.py", line 41, in execute
return self.cursor.execute(sql, params)
File "/srv/modoboa/python-virtualenv-modoboa-1.1.1/local/lib/python2.7/site-packages/django/db/backends/mysql/base.py", line 122, in execute
six.reraise(utils.IntegrityError, utils.IntegrityError(*tuple(e.args)), sys.exc_info()[2])
File "/srv/modoboa/python-virtualenv-modoboa-1.1.1/local/lib/python2.7/site-packages/django/db/backends/mysql/base.py", line 120, in execute
return self.cursor.execute(query, args)
File "/usr/lib/python2.7/dist-packages/MySQLdb/cursors.py", line 174, in execute
self.errorhandler(self, exc, value)
File "/usr/lib/python2.7/dist-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler
raise errorclass, errorvalue
IntegrityError: (1062, "Duplicate entry '0-NTFOxSLhytYl-1' for key 'PRIMARY'")

# Fixed code
def fetch(self, start=None, stop=None, **kwargs):
    emails = []
    for qm in self.messages[start - 1 : stop]:
        m = {
            "from": qm["mail__from_addr"],
            "to": qm["mail__msgrcpt__rid__email"],
            "subject": qm["mail__subject"],
            "mailid": qm["mail__mail_id"],
            "date": qm["mail__time_num"],
            "type": qm["mail__msgrcpt__content"],
            "score": qm["mail__msgrcpt__bspam_level"],
        }
        rs = qm["mail__msgrcpt__rs"]
        if rs == "D":
            continue
        elif rs == "":
            m["class"] = "unseen"
        elif rs == "R":
            m["img_rstatus"] = static_url("pics/release.png")
        elif rs == "p":
            m["class"] = "pending"
        emails.append(m)
    return emails