auth between postfix and dovecot?

[Alexander Dalloz]

Am 23.04.2022 um 16:08 schrieb Shawn Heisey:
> On 4/22/2022 10:35 PM, ミユナ (alice) wrote:
>> my question is:
>>
>> when postfix talks to dovecot, does it require user's 
>> username/password for authentication? or this communication just goes 
>> without authentication?

[ ... ]

> When postfix sends mail to dovecot for delivery, I'm pretty sure that 
> happens without authentication.  It's LMTP via unix socket, not 
> something an outside client can access directly.
> 
> # In 10-master.conf
> service lmtp {
>    unix_listener lmtp {
>      #mode = 0666
>    }
> }

[ ... ]

> # Tell postfix to hand off mail to the definition for dovecot in master.cf
> virtual_transport = dovecot
> dovecot_destination_recipient_limit = 1

With this Postfix configuration you do not make use of LMTP delivery.

Alexander