Remove bug

I've inherited an old application that is using Mhonarc 1.2.3, 
written with Perl 5. I have a problem with remove (-rmm). It is 
removing the files from disk but still displaying them on the 
maillist.html. My page is huge right now and I need to fix the 
problem. How do I get them to remove from the maillist? Should I 
upgrade software? If so, what version?

Thanks
Marianne