[Dovecot] troubles with broken clients (iPhone)

Sorry if the question has been answered before, but I haven't been able to find any relevant topic on your mailing list archive.

We are using Dovecot 1.1.6 with legacy mbox storage on a mail server of ours; the trouble is, users connected via DSL with both a computer and a iPhone on the same wireless network experience broken connections - this is very likely a file locking issue, and as such might happen with other broken clients reliying on persistent connections.

My question: is there a way to tell Dovecot the lock is owned _only_ by the latest connection opened by the same user, therefore closing all the others?

Thanks a lot for both your help and for making such a great POP3/IMAP client available

 		Federico Bianchi
		Dipartimento di Storia delle Arti
		Universita` di Pisa
		piazza S.Matteo in Soarta, 2 - I56127 Pisa (Italy)
		fax.+39-050-580128; e-mail: <f.bianchi@arte.unipi.it>
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