All, This is an odd scenario, but sadly one I find myself in.
Work is a large organisation, and currently does not have an SPF record. The reason is that there are a large (and unknown) number of internal and external parties that send mail on our domain, as well as sub-domains. So, even if we do determine who sends email on the domain, we would then have an issue with max lookups and record length. I know we can use an SPF flattening service. However that either has a cost. Or, although we can develop something in house, there's a 'bought not built' ethos being pushed by management. As an out the box idea, what would the potential impact be of having an SPF record stating just: "V=spf1 a mx +all" How bad of an idea would this be? If we also had a DMARC record set to either quarantine or reject. Regards, Simon
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