On 03/22/2016 05:43 AM, Harald Schilly wrote:
> 
> Seems like it works better now? However, we could add a SPF TXT line to
> the DNS of sagemath.org?  I.e. my idea is, that by including the sender
> explicitly in this "v=spf1 include:<whatever it is> ?all" entry, the
> score would get pushed higher (no longer neutral)
> 

That score is for an SPF *failure* whose result is neutral. There is an
SPF record for sagemath.org, but trac.sagemath.org isn't listed as a sender:

  $ dig +short sagemath.org spf
  "v=spf1 include:mail.zendesk.com ?all"

  $ dig +short mail.zendesk.com txt
  "v=spf1 ip4:192.161.144.0/20 ip4:185.12.80.0/22 ip4:96.46.150.192/27
  ip4:174.137.46.0/24 ip4:188.172.128.0/20 ip4:216.198.0.0/18 ~all"

  $ dig +short trac.sagemath.org
  128.208.160.253

I don't know what the connection with zendesk.com is, but at least
"a:trac.sagemath.org" needs to be added to the existing record. (And the
DNS record should be of type "TXT", not "SPF" -- everyone gave up on that.)

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