CentOS - Apr 2015 - Some subscribers posts to the list ending up in Gmail spam

On Sat, Apr 4, 2015 at 8:35 PM, Nataraj <incoming-centos at rjl.com>
wrote:
> On 04/04/2015 09:59 AM, Andrew Holway wrote:
>> Did we work out the technical reason why some users that post to the
list
>> are getting dumped into gmail spam?
>
> .  I believe that if, in your gmail account, you keep marking as "NOT
> SPAM" any false positives it will send more of these messages to the
> right folder.
No, I don't think it will ever learn from that,, but there is a way
you can set a rule to 'never mark as spam' based on the sender. Which
wouldn't be fun on a list with a lot of yahoo.com members.
> There has been an abundance of discussions in the past about these
> issues on the various mailman, dmarc and dkim mailing lists as well as
> in many other places.  This whole issue hit the fan early in 2014 when
> yahoo and aol changed their DMARC policy to reject incoming mail that
> failed the DMARC test.
It was discussed here, I think both before and after the mailman
changes were available.

-- 
   Les Mikesell
     lesmikesell at gmail.com

Le 2015/04/08 17:50 +0200, Les Mikesell a ?crit: 
> No, I don't think it will ever learn from that,, but there is a way
> you can set a rule to 'never mark as spam' based on the sender.
Which
> wouldn't be fun on a list with a lot of yahoo.com members.
FWIW, I recently solved one reason GMail was always marking my emails as
spam: my MTA has IPv6, and to send emails, it was by default using the
rfc3041 temporary addresses as source, so each time a different address
when connecting to Google's MX's.

As soon as I set it up to use the propre static IPv6, marking them as
?not spam? in Gmail subsequently worked. So it looks like they also keep
track of the sender's MTA address, not only of the email address.

Obviously not the reason for everybody, but hopefully it can help others :-)

Laurent

On 04/08/2015 09:40 AM, Laurent Blume wrote:
> Le 2015/04/08 17:50 +0200, Les Mikesell a ?crit: 
>> No, I don't think it will ever learn from that,, but there is a way
>> you can set a rule to 'never mark as spam' based on the sender.
Which
>> wouldn't be fun on a list with a lot of yahoo.com members.
> FWIW, I recently solved one reason GMail was always marking my emails as
> spam: my MTA has IPv6, and to send emails, it was by default using the
> rfc3041 temporary addresses as source, so each time a different address
> when connecting to Google's MX's.
>
> As soon as I set it up to use the propre static IPv6, marking them as
> ?not spam? in Gmail subsequently worked. So it looks like they also keep
> track of the sender's MTA address, not only of the email address.
>
> Obviously not the reason for everybody, but hopefully it can help others
:-)
>
> Laurent
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
Gmail has many different criteria that it uses for detecting spam.  One
of the things they do is to keep a credibility score based on the IP
address of a mailserver.  In general, they like to see all of the mail
for a domain coming from a single IP address.   Since mail.centos.org
uses a single IP address, this is not the problem here.

If one wanted to improve this situation, my sense is that the next thing
to do would be to strip off the DKIM signatures which have incorrect
checksums.

After that, the next thing that would improve gmail's spam scoring of
list mail would be to add a valid DKIM signature, but that is messier
for a mailing list because it would mean ugly rewriting of the from
header.  It is possible that simply stripping the original senders
DKIM's would solve the problem.

Nataraj