2.3.14: posting to shared mailbox results in 550 Permission denied

[Simon Matter]

> Hi,
>
> I have a server which I upgraded recently from 2.3.13 to 2.3.14.
> Now I realized that sending mail to shared folders doesn't work anymore.
> I have verified the problem on a test box and it looks like this:
>
> May 28 11:01:49 install lmtpunix[15085]: accepted connection
> May 28 11:01:49 install lmtpunix[15085]: lmtp connection preauth'd as
> postman
> May 28 11:01:49 install lmtpunix[15085]: verify_user(system) failed:
> Permission denied
> May 28 11:01:49 install postfix/lmtp[15077]: 87D6F34018:
> to=<+system at localhost.corp.invoca.ch>, orig_to=<+system at localhost>,
> relay=install.corp.invoca.ch[/var/lib/imap/socket/lmtp], delay=0.12,
> delays=0.09/0.01/0/0.03, dsn=5.7.1, status=bounced (host
> install.corp.invoca.ch[/var/lib/imap/socket/lmtp] said: 550-You do not
> have permission to post a message to this mailbox. 550-Please contact the
> owner of this mailbox in order to submit 550-your message, or postmaster
> if you believe you 550-received this message in error. 550 5.7.1
> Permission denied (in reply to RCPT TO command))
>
> The mailbox has the following permissions:
>
> localhost.localdomain> lam system
> anonymous p
> anyone lrs
>

What fails with 2.3.14 is append_check() in verify_user().

Any ideas?

Simon