[otrs] Reject of closed tickets not properly working

[Gabriele D'Andrea]

I'm running OTRS 2.1.7 and I' ve configured my queues so that follow ups for 
closed tickets are rejected.

Yesterday, I received a followup for a closed ticket, that wasn't rejected.
The syslog showed that entry

Aug  1 12:05:08 otrs OTRS-PM3-10[5620]: 
[Notice][Kernel::System::PostMaster::Reject::Run] Reject FollowUp Article to 
Ticket [2
007080110000014] created (TicketID=667, ArticleID=1566). Follow up rejected.

However the followup was in fact accepted all the same

I found an old post (dated 2004!) relating to the same problem in ver. 
1.3.2, with no response
http://www.mail-archive.com/otrs@otrs.org/msg06237.html

Thanks for any help
-- 
Gabriele D'Andrea