Hello

If I have a mx server: mx.host.com whose ip is 1.2.3.4.

The domain.com who use this mx server may have the following SPF.

v=spf1 mx ~all
v=spf1 ip4:1.2.3.4 ~all
v=spf1 a:mx.host.com ~all
v=spf1 mx:domain.com ~all

May i know if they mean the same stuff for SPF?

Thanks.
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