[Dovecot] Append with literal+ and mailbox over quota

[Ewald Dieterich]

I'm appending a mail with literal+ to a mailbox that is over quota:

1 APPEND INBOX {127+}
From: <ewald.dieterich at fun.de>
To: <ewald.dieterich at fun.de>
Subject: Quota-Test
Message-ID: <abcdefg at fun.de>

Quota-Test
1 NO [OVERQUOTA] Quota exceeded (mailbox for user is full)
2 NOOP
1 BAD Error in IMAP command APPEND: Invalid arguments.
3 NOOP
3 OK NOOP completed.

Somehow the first NOOP is considered to be part of the already failed
APPEND. I have to add an empty line after to NO response for the NOOP to
work:

1 APPEND INBOX {127+}
From: <ewald.dieterich at fun.de>
To: <ewald.dieterich at fun.de>
Subject: Quota-Test
Message-ID: <abcdefg at fun.de>

Quota-Test
1 NO [OVERQUOTA] Quota exceeded (mailbox for user is full)

2 NOOP
2 OK NOOP completed.

Can somebody confirm this to be bug?

Here is the output of doveconf -n

# 2.1.8: /usr/local/dovecot-orig/etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-5-amd64 x86_64 Debian 6.0.3 ext3
auth_debug = yes
auth_verbose = yes
debug_log_path = /var/log/dovecot/debug.log
disable_plaintext_auth = no
info_log_path = /var/log/dovecot/info.log
log_path = /var/log/dovecot/error.log
mail_debug = yes
mail_location = mdbox:/var/spool/dovecot/%2.256Hu/%3.4096Hu/%u
mail_plugins = notify mail_log quota acl
namespace {
   inbox = yes
   location =
   prefix = INBOX.
   separator = .
   type = private
}
passdb {
   driver = pam
}
plugin {
   acl = vfile
   autocreate = INBOX.Drafts
   autocreate2 = INBOX.Sent
   autocreate3 = INBOX.Trash
   quota = dict:User 
quota::file:/var/spool/dovecot/%2.256Hu/%3.4096/%u/dovecot.dict
   quota_rule = *:bytes=2000
}
ssl = no
userdb {
   driver = passwd
}
protocol imap {
   mail_plugins = notify mail_log quota acl autocreate imap_quota imap_acl