Hi Viktor,

On 03/23/2018 12:42 AM, Viktor Dukhovni wrote:
Almost certainly bounces, which did not come in via SMTP, they are originated
locally, when inbound mail from mail.ru is undeliverable, and sent outbound
via the smarthost.
Yes, they are originated locally, yes, using a webform that is currently being abused.

How can I make sure that this particular postfix instance will DISALLOW sending 
ANY email to @mail.ru?

Seems a rather harsh policy, but if you must:

        transport:
                mail.ru  error:5.1.2 Destination domain blacklisted

It's very harsh, but we'll do it just for the time being, until we have fixed the webform.

Your solution works super, thanks a lot!

Is there perhaps also another error code we can use, that blackholes the email, instead of politely bouncing it with a "Diagnostic-Code: X-Postfix; Destination domain blacklisted"?

MJ

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