On 06.12.22 02:58, linux...@gmx.net wrote:
If I have setup this:
smtpd_sender_restrictions = reject_sender_login_mismatch
does it work?
- you need proper smtpd_sender_login_maps
- restriction only applies for envelope (mail from:) address, not to header
(From:) address. you may apply milter like "vrfydmn" that can rewrite
header From: to envelope from: address, or refuse mail if those
two don't match.
> I found that when a sasl user passed the authentication, it can send
> email with any sender address, not only the sasl user itself.
>
> This may cause our mailsystem to be abused.
>
> How can I setup postfix to stop this behavior?
linux...@gmx.net skrev den 2022-12-06 02:06:
do you belive strongly that the From: header always is the sasl user
abusing ?
if so change sasl user password and wait for custommers to confirm :)
that sayed there is only little postfix can do with it, as all other say
if you want to make it stronger, it needs milters for this to happend
https://serverfault.com/questions/640756/postfix-login-mismatch-sender-address-rejected
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