Question 1

What should an SPF record include?

Accepted Answer

An SPF record should start with v=spf1, include authorized senders (ip4, include, a, mx), and end with an all mechanism such as ~all or -all.

Question 2

How many include mechanisms are allowed in SPF?

Accepted Answer

SPF DNS evaluation is limited to 10 DNS lookups. Too many include statements can break SPF validation.

SPF Checker Tool

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