Re: Using lmtp to authenticate email users

[Aki Tuomi via dovecot]

On 31 March 2019 17:41 Jerry via dovecot < dovecot@dovecot.org> wrote:

On Thu, 28 Mar 2019 05:22:37 -0700, Patrick Mahan via dovecot stated:

>FreeBSD 11.2

>Postfix 3.3.2

>Dovecot 2.3.4

>

>I am trying to use dovecot lmtp with postfix to verify authentication

>of incoming email and to avoid being a spam relay (an issue I was

>having using sendmail as my MTA).

>

>I am getting the following log message in /var/log/maillog:

>

>Mar 30 20:31:38 ns postfix/smtpd[40373]: NOQUEUE: reject: RCPT from

>mail-eopbgr750091.outbound.protection.outlook.com[40.107.75.91]: 450

>4.1.1 < ma...@mahan.org>: Recipient address rejected: unverified

>address: host ns.mahan.org[private/dovecot-lmtp] said: 550 5.1.1

>< ma...@mahan.org> User doesn't exist: ma...@mahan.org (in reply to

>RCPT TO command); from=< pma...@silver-peak.com> to=< ma...@mahan.org>

>proto=ESMTP helo=< NAM02-BL2-obe.outbound.protection.outlook.com>

>

>'mahan' does exist on ns.mahan.org. So I am confused to why lmtp is

>failing to find this username.

>

>Thanks,

>

>Patrick

>

You probably shuld be asking this on the Postfix forum. Have you read

< ">http://www.postfix.org/ADDRESS_VERIFICATION_README.html>? You also

have "smtpd_reject_unlisted_recipient" options. You really need to post

the output of "postconf -nf" and perhaps "postconf -Mf".

--

Jerry

I would try setting

auth_username_format=%Ln 

as otherwise domain part is included in username lookup...

---
Aki Tuomi