[Mailman-Users] Bug whith wrong adress

[Denis --]

Hello,

I have an admin lists who had by error some members with this error on
the mail adress:

.name at domaine.tld

Then, he can't suppress them 

What is possible to do ?

Thanks 
Denis

Here is the error log:

Traceback (most recent call last):
  File "/var/lib/mailman/scripts/driver", line 87, in run_main
    main()
  File "/usr/lib/mailman/Mailman/Cgi/admin.py", line 169, in main
    change_options(mlist, category, subcat, cgidata, doc)
  File "/usr/lib/mailman/Mailman/Cgi/admin.py", line 1354, in change_options
    mlist.ApprovedDeleteMember(user)
  File "/var/lib/mailman/Mailman/MailList.py", line 925, in ApprovedDeleteMember
    self.SendUnsubscribeAck(emailaddr, userlang)
  File "/var/lib/mailman/Mailman/Deliverer.py", line 78, in SendUnsubscribeAck
    Utils.wrap(self.goodbye_msg), lang)
  File "/var/lib/mailman/Mailman/Message.py", line 203, in __init__
    self['Subject'] = Header(subject, charset, header_name='Subject')
  File "/var/lib/mailman/pythonlib/email/Header.py", line 164, in __init__
    self.append(s, charset)
  File "/var/lib/mailman/pythonlib/email/Header.py", line 230, in append
    ustr = unicode(s, incodec)
UnicodeError: ASCII decoding error: ordinal not in range(128)