Forum bug - Gmail auto-flags as spam, as not following proper bulk sender methods

[mcb30]

(2015-08-01 08:10)NiKiZe Wrote:  From one forum mail:

Code:

Authentication-Results: mx.google.com;
       spf=fail (google.com: domain of apache@fensystems.co.uk does not designate 2001:ba8:0:1d4:e4c4:daff:fece:219b as permitted sender) smtp.mail=apache@fensystems.co.uk
Received: by duck.fensystems.co.uk (Postfix, from userid 73)

the spf record only allows the mx: "v=spf1 mx -all"

The mx aaaa does not point to the IPv6 address that the mail is sent from.
duck.fensystems.co.uk. 600 IN AAAA 2001:ba8:0:1d4::6950:5845

So by SPF I would say that gmail does the right thing.
The OpenSPF explanation: http://www.openspf.org/Why?identity=apac...ece%3A219b

Interesting; the 2001:ba8:0:1d4:e4c4:daff:fece:219b address is not the static IPv6 address that the server is configured to use (which is 2001:ba8:0:1d4::6950:5845, as per the MX record).

After some hacking around with the IPv6 configuration, I ended up manually creating /etc/sysconfig/network-scripts/ifup.d/static-ipv6 to contain:

Code:

#!/bin/sh
sysctl -w net.ipv6.conf.$1.accept_ra_pinfo=0

and it now seems to be correctly using only the static IPv6 address.

I don't think this was the only problem, though; I've seen multiple failures from GMail that didn't mention SPF.

Michael