Re: OFF TOPIC: Mail going into Trash/Spam

[gbWilly <gbWilly@xxxxxxxxxxxxxx>]

On Thursday, January 23rd, 2025 at 05:46, Christof Thalhofer <chrisml@xxxxxxxxxxx> wrote:

> I attach the source of a mail from you where they can see how their DKIM
> signature is built and that it includes headers that should not be used
> for their DKIM signature (especially
> List-Unsubscribe:List-Unsubscribe-Post) because these headers are set by
> maliing-list softwares later on:
> 
> > DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=protonmail.com;
> > s=protonmail3; t=1734881054; x=1735140254;
> > bh=vayFmlkYuh0mSTeLfyZjahqUSOklaweIlUmtKy1Hjfw=;
> > h=Date:To:From:Cc:Subject:Message-ID:In-Reply-To:References:
> > Feedback-ID:From:To:Cc:Date:Subject:Reply-To:Feedback-ID:
> > Message-ID:BIMI-Selector:List-Unsubscribe:List-Unsubscribe-Post;
> > b=I+I+OkslftGfE5F7DXJAk85n/NBmP/qxCem6C2OVesHKPJmW7A4nU0izKEfwtiUxn
> > DyNnopay8w3AxCa7HfJWihU72tn836hXkWWTFTJLZIF13ujrl6M12AXLggQIHO7w6S
> > QRG0Z/TZwFwIHzLt+yUpJittwIBKgtvNBum7UJZD8QB2Dc6ZjzXrwdU+DUaHdrkS1l
> > zjoOKYnRYz7+NtjK4WTMhx/N8GYn0cWLVMzIKeQ3bP9WJHT80KnSjCVJf+9SujQ2Dv
> > eo0w+rkgagjExDWpxqtnyF3QaF57iVuV0dj3hxRb25lvuvHPPB/8zIL3ge9Wc4u/E4
> > TkfSfqu5zfRWw==
> 
> 
> Alles Gute

From proton I received this (before I read above):
----
Hello Willy,
 
Thank you for responding.
 
It looks like you're trying to send emails from your @protonmail.com address, but using a third-party service - am I correct? Please note that this is not possible and you will face problems of this kind as those emails cannot pass (SPF, DKIM, and) DMARC evaluation successfully. Since our policy is p=quarantine, recipient platforms like Gmail will usually send failing emails to Spam. 
 
Please note that since you intend on sending emails from a third-party platform, I'd recommend purchasing your own custom domain so that you can then edit its DNS records and approve of the sending platform as authorized senders on your behalf. 
 
More details at https://proton.me/support/custom-domain. 
 
Looking forward to your response.
----

So, I just quoted them your (Christof) above explanation and added the attachement you send along with it.
Also explained them that other mail services seem to be able to handle mailing lists with no problem and only proton causes trouble.
Wonder what will happen next

gbWilly