30 Jul
2013
30 Jul
'13
10:50 p.m.
On Tue, Jul 30, 2013 at 11:37 PM, Nigel Rantor wrote:
I may be on to something...examining the raw message
in gmail shows the
following;
This explains.
The -all in your SPF record says that you will only send email from
the domains (in your case the A and MX records) that are listed in
your SPF record and you give recipients implicit permission to discard
emails pretending to come from you that fail SPF.
Not many recipients do that, because many domains use -all
incorrectly, but it means your emails will get a lot of spam-points
added and they're going to be blocked unless there is a good reason
for not blocking them. A 19-year old domain with a good reputation
could be such a reason and that's likely what made the difference
here.
The simplest solution would be to add your IPv6 address (or, perhaps,
your /64) to your SPF record as
ip6:2001:ba8:1f1:f03f:216:
4eff:fe05:ae0f.
Or stop sending email over IPv6 of course.
Martijn.