I have multiple accounts on giffgaff, to allow for my dongle.
Now, when giffgaff send me an email, I can never tell what account it is for! My username is not on it at all. I think that giffgaff should put the username of the member the email is being sent to on the email somewhere.
Here is an example of an email I recieved the other day:
The only mention of my username is in my affiliate link (which I have edited out). It was in the white gap near the very bottom, and it isn't as easy for newer customers to get the username from the affilliate link.
So, I think that the username of the recipient user should be included in the email. Not a bad idea I think