Why do I feel like I should have no faith in this unsubscribe form?
It's from Jitterbit, by the way. I've never heard of them before, like most companies that cold-contact me, and fuck those people.
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@georgieboy I am always so glad that I have the power to hard-reject (at SMTP time) email from addresses I don't like to my email.
Then of course vendors use mailing list providers that also send email that I have to accept, and I sigh a lot and dream of even more complex schemes.
Server run by the main developers of the project 
It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!
@cks Yeah, we use Cisco's gateway (and before that, proofpoint) both of which I can block senders or sending domains, but as you say, that gets trickier when they're using third party commercial mail services.