Mail addresses with quotes + Postfix

[Stephan Bosch]

Op 6-3-2018 om 14:34 schreef Philipp Berger:
> I upgraded to Dovecot 2.3.0.1 as advised, but it still seems broken. In
> the Postfix log I now see:
>
> Mar  6 13:49:03 myhost amavis[7165]: (07165-10) K00VtLRHdrYw FWD from
> <admin at mydomain.tld> -> <"@"@mydomain.tld>, BODY=7BIT 250 2.0.0 from
> MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as B8CA22DA1B37
> Mar  6 13:49:03 myhost amavis[7165]: (07165-10) Passed CLEAN
> {RelayedInbound}, [someIp]:11439 [someIp] <admin at mydomain.tld> ->
> <"@"@mydomain.tld>, Queue-ID: D27792DA167C, Message-ID:
> <22b95756-e95e-86cf-219c-3b603f7587c8 at mydomain.tld>, mail_id:
> K00VtLRHdrYw, Hits: -3, size: 7472, queued_as: B8CA22DA1B37, 1863 ms
> Mar  6 13:49:03 myhost postfix/smtp[2329]: D27792DA167C:
> to=<@@mydomain.tld>, relay=127.0.0.1[127.0.0.1]:10024, delay=2,
> delays=0.15/0.01/0/1.9, dsn=2.0.0, status=sent (250 2.0.0 from
> MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as B8CA22DA1B37)
> Mar  6 13:49:03 myhost postfix/pipe[2282]: B8CA22DA1B37:
> to=<@@mydomain.tld>, relay=dovecot, delay=0.2, delays=0.11/0/0/0.09,
> dsn=5.1.1, status=bounced (user unknown)
> Mar  6 13:49:03 myhost postfix/cleanup[2280]: EA37E2DA1F80:
> message-id=<20180306124903.EA37E2DA1F80 at mydomain.tld>
> Mar  6 13:49:04 myhost postfix/bounce[2334]: B8CA22DA1B37: sender
> non-delivery notification: EA37E2DA1F80
> Mar  6 13:49:04 myhost postfix/qmgr[21911]: EA37E2DA1F80: from=<>,
> size=9830, nrcpt=1 (queue active)
> Mar  6 13:49:04 myhost postfix/qmgr[21911]: B8CA22DA1B37: removed
> Mar  6 13:49:04 myhost postfix/pipe[2282]: EA37E2DA1F80:
> to=<admin at mydomain.tld>, relay=dovecot, delay=0.07,
> delays=0.05/0/0/0.02, dsn=5.3.0, status=bounced (command line usage
> error. Command output: lda: Fatal: Invalid -f parameter: Missing domain )
>
> I can see in my MySQL Log that Dovecot queried at the same time with %n
> = "" (empty) and %d = "@mydomain.tld". So now the "@" is dropped entirely.
>
> What does the "Fatal: Invalid -f parameter: Missing domain" tell us? Do
> I need to change the way Postfix calls Dovecot? Add more quotes? :D

Can you check what Postfix is feeding to Dovecot exactly (i.e., whether 
it is properly escaped)? Maybe wrap dovecot-lda in some shell script and 
see what is passed.

Regards,

Stephan.

>
> Kind regards,
> Philipp
>
> Am 04-Mar-18 um 21:12 schrieb Stephan Bosch:
>> Op 3/1/2018 om 2:07 PM schreef Philipp Berger:
>>> Dear all,
>>>
>>> I have a working setup with Postfix + Dovecot, storing users in a MySQL
>>> table.
>>>
>>> I ran into problems setting up and using a mail address like
>>> a"@"b at mydomain.tld, which by RFC should be valid, but leads to problems
>>> in Dovecot. From my debugging, I can see that on the lookup, Dovecot
>>> replaces %n with "a" (quotes added by me) and %d with "b at mydomain.tld"
>>> (quotes added by me). So the original quotes are gone, and the
>>> domain/user split is incorrect.
>>>
>>> I am not sure of Postfix passes the address without quotes to Dovecot or
>>> whether Dovecot can not handle quotes correctly, but I was hoping that
>>> someone with more insight into Dovecot could help me out here.
>>>
>>> System Info: Debian 9, Postifx 3.1.6-0+deb9u1, Dovecot 2.2.27-3+deb9u1
>>> Postfix master.cf for Dovecot:
>>> dovecot unix  -       n       n       -       -       pipe
>>>    flags=DRhu user=virtual:virtual argv=/usr/lib/dovecot/dovecot-lda -f
>>> ${sender} -d ${user}@${nexthop}
>>>
>>> I am grateful for any hints :)
>>>
>>> Thank you in advance, kind regards,
>> Yeah, Dovecot v2.2 is doing some funky stuff with SMTP address parsing.
>> Dovecot v2.3 should do a better job. I am still not sure if this can be
>> fixed well for Dovecot v2.2.
>>
>> Regards,
>>
>> Stephan.
>
>