[Dovecot] Segfaul probably during dsync

[Matthias Rieber]

 Hi,

 it's caused by a virtual folder:

 INBOX.IBX.Folder1
 INBOX.Ordner.Folder1
 INBOX.Ordner.Folder1.*
   OR (OR (OR HEADER FROM bar.com HEADER FROM bar.de) HEADER FROM 
 foo.com) HEADER FROM barfoos.net NOT HEADER FROM root@ NOT HEADER FROM 
 www-data@ SINCE 1-Jan-2010

 When I delete the dovecot.index.search* files it works for a while but 
 fails again.

 matthias