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Rogue Cell Tower Shut Down in London
(www.cityoflondon.police.uk)
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A lot of smaller businesses just aren't bothering to deal with it right now, relying on getting the opposing IT department to just whitelist their address is apparently working for them with their mail volume. I am talking smaller businesses, but also not mom and pop stores, we're talking national chains, etc. that just don't care about the impact. That is also assuming that whoever manages the receiving mail server has even managed to keep a policy to block items that fail SPF/DKIM in the first place.
Gmail and Yahoo are pushing and I love that, but they're just a bit ahead of the game.