[dmarc-discuss] SPF DNS lookup limit and 3rd parties

Matt Vernhout dmarclist at emailkarma.net
Tue Jun 3 06:59:23 PDT 2014


Michiel,

I'd recommend you look at using a branded sub domain for your ESP (
esp.mycompany.com) and CRM (crm.mycompany.com) solutions - then you only
need to authenticate against on vendor for each domain and not against
multiple vendors in a single record.

~ Matt Vernhout
Founder, Editor

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On Tue, Jun 3, 2014 at 3:13 AM, Michiel van de Vis via dmarc-discuss <
dmarc-discuss at dmarc.org> wrote:

> Hello everybody,
>
> As most of you will probably know, there is an limit on the number of DNS
> lookups (10 lookups, a,mx,include,ptr,exists) while validating an SPF
> record.
>
> I think it is good to have this limit, but is there a policy for third
> party senders on how to setup a SPF record?
>
> For instance outlook.com (or spf.protection.outlook.com) uses 10 lookups
> which makes it impossible for a sender to use both Outlook and a random
> other third party (for instance an ESP or CRM) through an include.
>
> Some third party senders:
> Outlook / Office 365 : 10 lookups
> Google Apps: 3 lookups
> Amazon SES: 0 lookups
>
> How do you feel about this and should there be a policy on this?
>
> Kindest regards,
>
> Michiel
>
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