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by jiggy2011 4834 days ago
Yes, it was a fairly weak hypothesis. OTOH we got on several RBLs a number of times and managed to get taken off them. Once I added an SPF record it hasn't been a problem since.

Didn't use SPF to begin with because there was a large number of hosts legitimately sending mail for the domain and it was a pain to get all of the IP numbers for various crazy reasons.