SMTP behavior difference between return-path, reply-to and from

Let’s start with a simple example. Let’s say you have an email list, that is going to send out the following RFC2822 content.  (References: VERP RFC Bounce Messages) From: <coolstuff@mymailinglist.com> To: <you@yourcompany.com> Subject: Super simple email Reply-To: <coolstuff-threadId=123@mymailinglist.com> This is a very simple body. Now, let’s say you are going to send it from a mailing list, that…
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