I've had three different ISP's over the last 10 years or so. I am still
able to use the email accounts I set up with the first two even though I
switched from the first provider about 10 years ago and the second, about
two years ago. I can only receive email from the oldest one but I can send
and receive mail with the second. Is there any particular reason why these
accounts are still live after I have moved to a new ISP?