Disable Dovecot LDA

[Jerry]

On Thu, 2 Apr 2020 13:18:14 +0000, Adam Raszkiewicz stated:
>Desired flow looks like:
>
>Dovecot ---------------------> Postfix --> Relay Server -┐
>Dovecot <-- LMTP/LDA <-- Postfix <---------------------┘
>
>Top part of that flow works fine - a message will get to the relay
>server and it will be send back to the postfix for a local delivery
>but then it will start to loop back to the relay server instead hand
>over to LMTP/LDA. 
>
>For some reason Postfix  doesn't know that abcd at localdomain.com is
>located on Dovecot and it will try to send it back to the relay
>server. I have the same problem explained here:
>https://serverfault.com/questions/1010325/postfix-via-relay-server-and-lmtp-configuration-for-incoming-delivery-to-local-m
>
>Thanks for any help!
>~Adam
>
>On 4/1/20, 6:45 PM, "dovecot on behalf of Dauser Martin Johannes"
><dovecot-bounces at dovecot.org on behalf of mdauser at cs.sbg.ac.at> wrote:
>
>    On Dienstag, 31. März 2020 21:14:26 CEST Adam Raszkiewicz wrote:
>    > But then it loops again when get back to the postfix as an
>    > incoming message (doesn't know that abcd at localdomain.com is
>    > located on that Dovecot)  
>    +
>    > Is there any way to disable Dovecot LDA? I want to always send
>    > email via postfix and relay server even it will be a local
>    > delivery within the Dovecot server
>    >
>    >Thanks,
>    >Adam  
>    
>    Why should a disabled LDA or a relayhost help in this matter?
> Honestly, who is sending what to where anyway? 
>    
>    I mean Dovecot is an IMAP-Server: It receives emails from Postfix
> and mailclients connect to Dovecot to get these mails. When a
> mailclient sends an email it connects to Postfix not to Dovecot, so a
> delivery "within Dovecot" isn't really happening. Dovecot's LDA has
> options to send (bounce) mails back to Postfix. I guess loops occur
> there? 
>    WHO doesn't know that abcd at localdomain.com is located on Dovecot
> -- Dovecot itself (= unknown recipient or perhaps permission problems
> while saving the mail) or Postfix (= no transport to Dovecot)? 
>    
>    Martin

This question really belongs on the 'postfix' forum. Have you read
<http://www.postfix.org/DEBUG_README.html> or better still,
<http://www.postfix.org/DEBUG_README.html#mail>. The "postfinger" tool
is the best way.

-- 
Jerry
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