Any idea to whitlist ?

On 16 May 2022, at 9:35 pm, Matus UHLAR - fantomas <uh...@fantomas.sk> wrote:
perhaps the null address at outgoing server, so you don't reject your own 
bounces

W dniu 16.05.2022 o 14:46, Viktor Dukhovni pisze:
No.  Better to apply the reject rule only on the inbound side, where
it should only lead to bounces on remote systems.

The OP's own systems should be sending outbound mail via the outbound MTA.

On 16.05.22 14:52, natan wrote:
Maybe smart loop if then ? But I do not know if it is not overcomplicated and what it would look like

please explain more deeply what do your inbound and outbound mailservers exactly do.

perhaps explain, how did e-mail 4L1w1y6WBVz1DDmK enter your mailserver
- if you could block it the way in, you wouldn't have to generate bounce.

I guessed your incoming server is used as MX, and outgoing server for outbound e-mail from your clients.

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