Person 1
ISP: BT Broadband
email address 1: person1@btconnect.com
email address 2: person1@gmail.com
Person 2
ISP: Sky Broadband
email address 1: person2@sky.com
email address 2: person2@gmail.com
email address 3: person2@btinternet.com
This is the problem.
Person 2 can send...