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A comment on I got my first $50/mo customer. Parent comment

Re:I got my first $50/mo customer by jfkebwjsbx on Wednesday May 06, 2020 @05:57PM (#23096807)
It works for common spam, but it does not really work for curated lists because they can remove it.

(I think it is also an RFC standard, not just gmail, but don't quote me on this).

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Re:I got my first $50/mo customer by kcolford on Wednesday May 06, 2020 @06:52PM (#23097356)
Not an RFC standard but it is a "de facto" standard. Everyone implements it, the config line for it is just commented out on postfix, super easy to use.
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