If a recipient of a requested signature rejects the document, then the canceled document is sent back to me on behalf of the sender. However, this leads to a positive result in our SPAM detection and the mail ends up in the SPAM folder. However, the actual sender of the mail is not the recipient but adobesign@adobesign.com.
Since there are more and more phishing mails on the way in these days, Adobe should not be detected as a false sender here as well.
Sending in the name of another person should be avoided.