dovecot - Jun 2022 - Move sent emails to sent folder?

See below.
> On Jun 16, 2022, at 8:50 PM, Gedalya <gedalya at gedalya.net> wrote:
> 
> On 6/17/22 07:33, Austin Witmer wrote:
>> Hello all!
>> 
>> I have a server running dovecot & postfix. I have a user on my
server who is sending email via smtp on an HP printer and because of that, a
copy of the email is not placed in the sent folder like usually happens with
clients like outlook and thunderbird.
>> 
>> Is there any way to have the sent emails copied to the sent folder for
just this user on my server?
>> 
>> Thx! 
>> 
>> Austin Witmer
> 
> On the postfix side, use sender_bcc_maps to add a user+sent at domain
recipient. This will send the message back as an incoming message to the user,
with the +sent address detail.
Do I add this to my postfix main.cf file and what is the exact syntax? Will this
affect all users or just this user?
> 
> On the receiving end, use sieve to check for the +sent address detail, mark
as read and file into the Sent folder.
I already have sieve set up, so this part should be
easy.
>

On 6/17/22 12:29, Austin Witmer wrote:
> Do I add this to my postfix main.cf file and what is the exact syntax?
Yes, e.g.:
sender_bcc_maps = hash:/etc/postfix/back-to-sent-folder

/etc/postfix/back-to-sent-folder : (simple key-value)
user at domain user+sent at domain

hash the file with: postmap back-to-sent-folder
this will create back-to-sent-folder.db which is what postfix will actually look
at

>  Will this affect all users or just this user?
The content of the file determines that.

For details: https://www.postfix.org/postconf.5.html#sender_bcc_maps

In this example, we have only one line affecting only one user.

The data can be taken from other sources, including SQL database:

https://www.postfix.org/DATABASE_README.html#types