Originally Posted by The Boz View Post
I’m sure my method will reach enough people
A signature on a USPS delivery receipt shows that the correspondence was accepted
by someone in the organization, either by the addressee or an employee whose duty
presumably includes delivering it to the addressee.

I'm not sure how the sender could substantiate that an addressee received an email.

Will you show your emails with the headers, so that we can see where you sent this letter?