mailgroups

[johans]

when trying to add multiple mail adresses to a single mail group we got this error :

MailManager encounter an error: mailmng failed: Unfortunately, the current version of Control Panel has limit on amount of mail groups a single mail name can be subscribed to.

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0: C:\Program Files\SWsoft\Plesk\admin\plib\class.MailManager.php:52 psaerror(string "MailManager encounter an error: mailmng failed: Unfortunately, the current version of Control Panel has limit on amount of mail groups a single mail name can be subscribed to.")
1: C:\Program Files\SWsoft\Plesk\admin\plib\cmd_mail.php3:1592 mailmanagermaker()
2: C:\Program Files\SWsoft\Plesk\admin\htdocs\domains\mail\mn_edit.php3:338 rm_mbox_quota(integer "24", string "blabla", string "blabla.info")

we have got mailgroups containing more than 100 users and using mailinglists is not an option because that would require all 'current members' to reregister

any ideas?
tx,
Johan