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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