I'll try to explain it with an example: when sending a mail to a list of local
users, the first of them receive it ok, but the last ones don't. Those lost
messages stay at /var/spool/mail. These messages are exactly the same for all
users, so the only difference that I can see is the increasing delay shown in the
logs.

This behaviour is independent of the origin of mail (local or from another
machine).

Messages sent to a single user never get lost.

    Albert

Wietse Venema wrote:

> How does a "lost email in /var/spool/mail" differ from mail that
> is not "lost"?
>
> Wietse
>
> Albert Martorell:
> > Adding "maildrop_destination_recipient_limit = 1" in main.cf solved part of
> > the problem, so I thought that I might be missing something else in postfix
> > rate controls.
> >
> > Mails that appear at /var /spool/mail are multiple-local-users destined, so
> > their delays increase with every delivery. Loss of mails seems to be related
> > to this effect.
> >
> > Albert
> >
> >
> > Wietse Venema wrote:
> >
> > > Postfix hands the mail over to the maildrop program. Postfix logs
> > > that maildrop completed successfully. Yet you believe that it is
> > > Postfix that loses the mail?
> > >
> > > Wietse
> > >
> > > Albert Martorell:
> > > > Hi all,
> > > >
> > > > I've been running Postfix + Maildrop + Courier IMAP/POP + LDAP on a
> > > > RH6.2 for two weeks, with maiboxes at /home/directories in maildir
> > > > format. All seems to work fine, except that every day some "lost" mails
> > > > appear in the /var/spool/mail. Users affected vary randomly and senders
> > > > of these mails are indistinctlly local an not local. Permissions in home
> > > > directories are ok.
> > > >
> > > > In the maillog, nothing strange seems to happen, but some delay:
> > > >
> > > > Jan 22 11:12:04 hostname postfix/pipe[1495]: 4E49B3BD10:
> > > > to=<userdomain.dom>, relay=maildrop, delay=425, status=sent
> > > > (hostname.domain.dom)

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