Re: Mail addresses with quotes + Postfix

Op 7-3-2018 om 13:46 schreef 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?

Adding " to auth_username_chars would help. But why are you trying to accept such incredibly horrible email-addresses/usernames? Regards, Stephan.

Kind regards, Philipp

Am 06-Mar-18 um 15:08 schrieb Stephan Bosch:

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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 -> <"@"@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] -> <"@"@mydomain.tld>, Queue-ID: D27792DA167C, Message-ID: <22b95756-e95e-86cf-219c-3b603f7587c8@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@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=, 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

Op 6-3-2018 om 14:34 schreef Philipp Berger: script and see what is passed.

Regards,

Stephan.

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Kind regards, Philipp

Am 04-Mar-18 um 21:12 schrieb Stephan Bosch:

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Op 3/1/2018 om 2:07 PM schreef Philipp Berger:

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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.