I upgraded to Dovecot 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
<ad...@mydomain.tld> -> <"@"@mydomain.tld>, BODY=7BIT 250 2.0.0 from
MTA(smtp:[]: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] <ad...@mydomain.tld> ->
<"@"@mydomain.tld>, Queue-ID: D27792DA167C, Message-ID:
<22b95756-e95e-86cf-219c-3b603f758...@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=[]:10024, delay=2,
delays=0.15/0.01/0/1.9, dsn=2.0.0, status=sent (250 2.0.0 from
MTA(smtp:[]: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:
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=<ad...@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

Kind regards,

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...@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...@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.

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