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OpenSMTPD proc filters & fc-rDNS

by gilles [@], on the 2018-12-06 21:31:00+01:00

TL;DR:
I *FINALFUCKINGLY* commited proc filters support allowing full filtering in OpenSMTPD.
eric@ implemented fc-rDNS lookups.

fc-rDNS

fc-rDNS, or forward-confirmed reverse DNS, consists in performing a reverse DNS lookup to determine the hostname associated to an IP address… then performing a DNS lookup on that hostname to check if …


OpenSMTPD reporting update

by gilles [@], on the 2018-11-09 08:27:00+01:00

TL;DR:
The reporting mechanism has been described shortly in my previous article about both reporting and filters.
Let's focus a bit more on the reporting bits this time.
The format is improving further and has extended to outgoing trafic reporting.

Reporting

In previous article, I described the events …


OpenSMTPD released and upcoming filters preview

by gilles [@], on the 2018-11-03 17:27:00+01:00

TL;DR:
Filters have been a (the most ?) long awaited feature in OpenSMTPD.
I finally committed most of the filters code to OpenBSD.
There is still a bit of work required but the trickiest parts are done.
This article describes how filters are implemented and what to expect.

Good news, everyone!

OpenSMTPD 6 …


switching to OpenSMTPD new config

by gilles [@], on the 2018-05-21 18:32:00+02:00

TL;DR:
Switching to new config is not too hard and can be done in minutes.
The new config is also a new queue that is not backwards compatible.
The easiest way is to flush the mail queue before switching.
We came up with a solution to help maintainers of …

OpenSMTPD new config

by gilles [@], on the 2018-04-30 12:00:00+02:00

TL;DR:
OpenBSD #p2k18 hackathon took place at Epitech in Nantes.
I was organizing the hackathon but managed to make progress on OpenSMTPD.
As mentionned at EuroBSDCon the one-line per rule config format was a design error.
A new configuration grammar is almost ready and the underlying structures are simplified …