Hi,
Thank you for your prompt reply!
I got the terminology mixed up, ofcourse milters are for incoming emails :)

But well, hopefully someone lurking here knows a solution.
--
Jonathan Sélea


On 2022-07-21 20:33, Viktor Dukhovni wrote:
On Thu, Jul 21, 2022 at 08:26:37PM +0200, Jonathan Sélea wrote:

Hopefully this question is relevant for this mailing-list..
Does anyknow know of a TLS-RPT milter for postfix that can generate and
send reports, kinda like what you can do with OpenDMARC?

This is not possible as matter of principle, because TLS-RPT messages
are about TLS issues in *outbound* mail, while milters handle *inbound*
mail.  TLS-RPT would requires processing log information, at a
granularity that is not currently available.

My own preference would be to implement in-band signalling (an ESMTP
extension) that would inform the remote SMTP server of {(most) TLS
issues as part of the SMTP connection setup.

It would then be up to the remote SMTP server to log such reports as it
sees fit.

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