Mail addresses with quotes + Postfix

[Philipp Berger]

I wrapped the LDA command in a script. I can see that Postfix passes
"@@mydomain.tld" as the -d argument, without quotes.
I then adapted the script to specifically replace this address with
"@"@mydomain.tld, but this results in the following error message by
Dovecot:

    auth: Info: userdb(?): Username character disallowed by
auth_username_chars: 0x22 (username: "@"@mydomain.tld)

So what would be the appropriate quoting/setting for this address?

Kind regards,
Philipp

Am 06-Mar-18 um 15:08 schrieb 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.
>>
>>
>