I have noticed when I go into my email settings under email there is a box which says default sender address. At the moment this is correct and has my email address but if I click on the dropdown arrow it brings up two other email addresses which I can also pick from. I do not know what these other two email addresses are. They are both blueyonder like my current email address but I do not have any other blueyonder email addresses so not sure why these are linked to my account.
I did a test and sent an email to both email addresses and it comes through to my inbox. I just don't understand what these two email addresses are and why they are linked to my account.