Hi, On 17 Jan 2024 at 12:30:15, Henrik Morsing via GLLUG wrote: > On Mon, Jan 15, 2024 at 07:45:25PM +0000, Carles Pina i Estany via GLLUG > wrote: > > > > Hi, > > > > Hi, > > > > > Side note, almost unrelated. > > > > In a personal/family server I have a nightly script that sends me which > > emails have been rejected by the server. Why? Postfix, in my > > configuration, rejects some emails. For example, from the Birmingham > > Zoo, bto.org, etc. so I get an email in the morning with the rejections > > of the day before and if I want to I add them in sender_access. In 1.5 > > years I have 14 domains there. > > > > When time allows, I will add the DKIM rejections as well, based on your > > case. Just in case. So thanks for sharing. I wonder if DKIM is rejecting > > some "legit" (or "expected") email. > > > > Sounds very useful, something you can share or is it top secret?
Nothing top secret. It's not a public script because I have it in a repo with internal tools for the personal server. What I have detects the emails rejected by "Client host rejected: cannot find your reverse hostname" and "Client host rejected: cannot find your hostname". This is the script that parses the Postfix logs for those errors: https://gist.github.com/cpina/e97c0da58f42a0db83b3886674de4410 I call (from cron) it from this Bash script: https://gist.github.com/cpina/79b4f425facb6b97aaea4c572307de3a The email looks like this: https://gist.github.com/cpina/4c49df824742c5ae1d273170939795be The reason that I wrote it was, as I said, I set up postfix to reject emails based on the hostname (it reduced Spam) but some, very few services, have the email set up in a way that is wrong. Then I can see them and I add them in sender_access in Postfix. What I will do, some day, is make sure that emails rejected because of DMARC, are also there. So, if I expected an email from britishgas or whoever and it appears in the morning email the day after, I would know faster. Not ideal, but email seems full of not-ideal things :-) Cheers, -- Carles Pina i Estany https://carles.pina.cat
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