LMTP proxy does not pass RCPT TO: ... 5xx response back

[Heiko Schlittermann]

Hello,

I'm using dovecot 2.2.9 and a director/backend setup.
On the director I've the LMTP in proxy mode, mapping the users to one of
the backends.

The backends to quota check and return the OverQuota message already at
RCPT TO  time.

Here is what I typed, connected to the director

    Connection to director1 2525 port [tcp/*] succeeded!
    220 director1.rz.hs-example.de Dovecot (Ubuntu) ready.
    LHLO mailhub1.rz.hs-example.de
    250-director1.rz.hs-example.de
    250-8BITMIME
    250-ENHANCEDSTATUSCODES
    250 PIPELINING
    MAIL FROM:<hs at schlittermann.de>
    250 2.1.0 OK
    RCPT TO:<heiko at hs-example.de>
    250 2.1.5 OK

And here is, what TCPDUMP sees (cut for clarity):

    00:22:23.029251 IP6 2001:638:914:f33::5:1.59466 > 2001:638:914:f33::5:ff.2525: Flags [S], 
    00:22:23.029376 IP6 2001:638:914:f33::5:ff.2525 > 2001:638:914:f33::5:1.59466: Flags [S.],
    00:22:23.029660 IP6 2001:638:914:f33::5:1.59466 > 2001:638:914:f33::5:ff.2525: Flags [.], 
    00:22:23.051436 IP6 2001:638:914:f33::5:ff.2525 > 2001:638:914:f33::5:1.59466: Flags [P.],
    .7i`.7jN220 backend1.rz.hs-example.de Dovecot (Ubuntu) ready.
    00:22:23.051805 IP6 2001:638:914:f33::5:1.59466 > 2001:638:914:f33::5:ff.2525: Flags [.], 
    00:22:23.052017 IP6 2001:638:914:f33::5:1.59466 > 2001:638:914:f33::5:ff.2525: Flags [P.],
    .7jT.7i`LHLO director1.rz.hs-example.de
    00:22:23.052034 IP6 2001:638:914:f33::5:ff.2525 > 2001:638:914:f33::5:1.59466: Flags [.], 
    00:22:23.052114 IP6 2001:638:914:f33::5:ff.2525 > 2001:638:914:f33::5:1.59466: Flags [P.],
    .7ia.7jT250-backend1.rz.hs-example.de
    250-XCLIENT ADDR PORT TTL TIMEOUT
    250-8BITMIME
    250-ENHANCEDSTATUSCODES
    250 PIPELINING
    00:22:23.052476 IP6 2001:638:914:f33::5:1.59466 > 2001:638:914:f33::5:ff.2525: Flags [P.],
    0EH....d......  ..3........ ..8 ..3.........J   .....
    .7jT.7iaXCLIENT ADDR=2001:638:914:f33::7:1 PORT=60574 TTL=4 TIMEOUT=30

    00:22:23.052540 IP6 2001:638:914:f33::5:ff.2525 > 2001:638:914:f33::5:1.59466: Flags [P.],
    0EH...E....~e.....3........ ..8 ..3........     ..J
    .7ia.7jT220 backend1.rz.hs-example.de Dovecot (Ubuntu) ready.

    00:22:23.052815 IP6 2001:638:914:f33::5:1.59466 > 2001:638:914:f33::5:ff.2525: Flags [P.],
    0E.....s......  ..3........ ..8 ..3.........J   ....E
    .7jT.7iaLHLO director1.rz.hs-example.de

    00:22:23.052870 IP6 2001:638:914:f33::5:ff.2525 > 2001:638:914:f33::5:1.59466: Flags [P.],
    0E....h....~......3........ ..8 ..3........     ..J
    .7ia.7jT250-backend1.rz.hs-example.de
    250-8BITMIME
    250-ENHANCEDSTATUSCODES
    250 PIPELINING

    00:22:23.053120 IP6 2001:638:914:f33::5:1.59466 > 2001:638:914:f33::5:ff.2525: Flags [P.],
    0E.....qJ.....  ..3........ ..8 ..3.........J   ....h
    .7jT.7iaMAIL FROM:<hs at schlittermann.de>
    RCPT TO:<heiko at hs-example.de>

    00:22:23.091824 IP6 2001:638:914:f33::5:ff.2525 > 2001:638:914:f33::5:1.59466: Flags [.], 
    0E.........~,.....3........ ..8 ..3........     ..J
    .7ik.7jT
    00:22:23.119918 IP6 2001:638:914:f33::5:ff.2525 > 2001:638:914:f33::5:1.59466: Flags [P.],
    0E.........~......3........ ..8 ..3........     ..J
*   .7ir.7jT250 2.1.0 OK
*   552 5.2.2 <heiko at hs-example.de> Quota exceeded (mailbox for user is full)

    00:22:23.158836 IP6 2001:638:914:f33::5:1.59466 > 2001:638:914:f33::5:ff.2525: Flags [.], 
    0F4....j......  ..3........ ..8 ..3.........J   .....
    .7jo.7ir
    00:27:23.029008 IP6 2001:638:914:f33::5:1.59466 > 2001:638:914:f33::5:ff.2525: Flags [F.],
    0F4....E......  ..3........ ..8 ..3.........J   .....

It looks as if the backend tells the director/proxy about the full
mailbox (552 5.2.2 <heiko at hs-example.de> Quota exceeded (mailbox for
user is full)) already before the DATA phase starts, right as the
response to the RCPT TO.

But the proxy seems to ignore it…
Any suggestion?


    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann
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