dhcpcd-discuss

On 2019/06/24 15:02, Roy Marples wrote:
> Hi List
> 
> gmail seems to be classifying some dhcpcd messages as spam.
> Sadly (and thankfully!) there is not enough daily mail sent to use Google
> Postmaster tools to analyse why.
> However, their document does specify that a List-Unsubscribe-Post: header
> should be present (which RFC 8058 also specifies). I don't know why this
> should be required but I've added it and tests from my personal gmail
> account seem to work fine.
> 
> So please check your spam folders for any messages that you might have
> missed and please let me know off list of any problems moving forwards.
> 
> Thanks
> 
> Roy
> 

If the domain in a From: address on a list mail has a dmarc entry with
p=reject and the mail has a DKIM signature for something which gets
modified by the list server (for example if it's a new thread and the
list server rewrites the Subject line to add [dhcpcd-discuss]), that's
very likely to get blocked.

In that case the list software needs to rewrite From and strip the
existing DKIM signature (and preferably add its own that matches the new
From address). Some lists only rewrite From for senders with p=reject,
but it's quite common now to rewrite From for all senders (in conjunction
with adding your own DKIM this is especially useful if you deliver into
google over IPv6, they have fairly stringent requirements in that case).