I am sorry to say this in th lounge but I am struggling with this issue

I am running an email server -Posftix (Virtual domains) ,fetchmail, clamv, spammassasin.

The problem is if userA send postmarked (available in outlook 2007) emails to userB,C etc i.e in the same domain, the outlook for userB,C .. crashes if it is 2007 and the mail will not be removed from the server, send and receive again the email will come again as new mail.

Current solution to this before forwarding the postmarked email there is a script that delete the hashed puzzle and the puzzleid but at times it is slow if the server receive more postmarked emails. is there any way to solve this