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Let's say I have three domains:

For each, I have the following SPF records:
v=spf1 ip4:x.x.x.x ip4:y.y.y.y ~all
v=spf1 ip4:c.c.c.c ip4:d.d.d.d ~all
v=spf1 ip4:.e.e.e.e ip4:f.f.f.f ~all

Now, I am sending my email from following domains:

MFROM (return-path): PRA (from):

For these two domains, I have following SPF:
v=spf1 ~all

When I test this structure through SPF test tools, it passes. But I wonder if adding "a" and "mx" to the SPF record of, and will increase Hotmail/Yahoo/Gmail/AOL inbox delivery success.

Any ideas/suggestions?



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1 Answer 1

up vote 2 down vote accepted

That's.. convoluted. A device wishing to validate SPF on one of the test domains will need to do four different record lookups; I would not be surprised if some of the MTAs in use by those organizations capped their lookups to something lower.

Why not just keep it simple, and avoid having to ask yourself if service providers will put up with your numerous includes?
v=spf1 ip4:x.x.x.x ip4:y.y.y.y ip4:c.c.c.c ip4:d.d.d.d ip4:e.e.e.e ip4:f.f.f.f ~all
v=spf1 ip4:c.c.c.c ip4:d.d.d.d ip4:e.e.e.e ip4:f.f.f.f ~all
v=spf1 ip4:e.e.e.e ip4:f.f.f.f ~all
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Thanks for your answer. You're right. I am going to merge all SPF's into one big SPF on – Willy Apr 29 '11 at 14:48
but what about "a" and "mx" parameters in the SPF record. Should I also add them? – Willy Apr 29 '11 at 14:48
If the host definitions that you have already cover the senders that need to be authorized, then there's no need; the ip4 rules are sufficient. – Shane Madden Apr 29 '11 at 15:10

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