[Dovecot] POP (dot) locks

[Ken A]

Timo Sirainen wrote:
> ... currently Dovecot doesn't try to lock mbox for the whole POP3
> session. That may create problems if two sessions actually try to access
> the mailbox concurrently. If message gets expunged by another process,
> Dovecot replies with -ERR to requests to fetch the message. That might
> confuse some POP3 clients, or cause them to send errors to user.
>
>   

Is there currently any way to enforce mbox r/w locking for the entire 
pop3 session in Dovecot?
We're considering migrating from qpopper and need a pop3 server that 
enforces locking while a session is active.
Thanks,
Ken A

> I don't think normally anyone even tries concurrent POP3 access? Anyway,
> I have thought before that Dovecot/pop3 should lock the mbox for the
> whole time, just like all others POP3 servers do (and RFC says too)..
> I'll add in TODO.
>
>