Block permissions to send as this sender

[xalex77 (lv)]

NethServer Version: 7.6.1810 (final)
Hi,
I installed the mail server (postfix, dovecot) I configured a Thunderbird test client in IMAP,
if I change the identity of the sender specifying any email address, the mail is sent anyway, how can I block this?
I want to block the ability to specify addresses other than the authenticated user

[saitobenkei]

Maybe this helps:

Enable SMTP Login/Sender address validation

Thanks to @stephdl it is now possible to Check authenticated user/identity before sending ¹: current SMTP/AUTH login name must be authorized to use a sender address. Imagine that we have the user joe and the account domain example.com. The following rules apply: User joe can write as joe@example.com If joe is listed as recipient in the email alias sales@example.com he can also send messages as sales@example.com Similarly, if joe is recipient for email alias joe.brown@aliasdomain.com he can…

[xalex77 (lv)]

with the new manager you can set it by email - relay …