It appears that Kaspar Etter <kaspar(_at_)ef1p(_dot_)com> said:
Thank you for the additional context. Personally, I strongly object to the
idea that mail service provider (MSP)
and email service provider (ESP) can stand for different things.
Unfortunately, you're at least a decade too late. The terms are well
established in the industry
and there is no point in trying to change them now.
R's,
John
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