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Re:How We Make Money at Stack Overflow by andreasklinger on Tuesday November 15, 2016 @03:32PM (#12961936)
Yes it's pretty much common best practice

Mail providers offer sending to your webhooks or block them directly on their side (so you dont have to worry about it)

Re:How We Make Money at Stack Overflow by thewhitetulip on Wednesday November 16, 2016 @12:46AM (#12964813)
Many do that probably, Indian firms don't for sure, I always block them, spam them and complain via twitter and after weeks of follow up do they remove my email id from their spam emails.