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Niro
Asked: 2016-09-02 06:53:51 +0800 CST

more than 10 DNS searches for SPF

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SPF allows up to 10 DNS calls. We use multiple email providers and overall get 13 DNS calls for SPF.

The solutions I've found so far:

  1. Manually collecting and "inlining" the IP addresses to reduce DNS lookups. Unfortunately this makes the entry static and will not be up-to-date when providers update their SPF records.

  2. Creating subdomains for one/few of the SPF providers - won't work for business reasons.

  3. Using an "SPF proxy" - I found only spfproxy.org (now defunct?) and I'm afraid to use them because I can't find who is behind it and they don't answer emails.

What options do I have? Ideally a solution like spfproxy which I can trust would work for me but I could not find any.

domain-name-system spf

1 Answers

    1. Does your SPF use the mx mechanism? (e.g., v=spf1 mx include:spf.example.com ip4:192.0.2.1 -ALL) as the mx mechanism adds lookups that are almost always redundant but you can verify that. You might be able to fix your SPF by removing the mx mechanism.

    2. Use an SPF Minimizer to get a more efficient SPF record.

    Note: could you post your SPF record here?

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