Quite a lot of important e-mails I receive come from organisations I have never been in contact with by e-mail in the first place.
Which is the reason for jarani's third paragraph.
I'm still using e-mail addresses set up eight and 11 years ago, the latter is connected with one ISP's dialup PAYG account and the former because, just before leaving this particular ISP, I set up a dialup PAYG account to maintain the e-mail address.
Even though I rarely check these PAYG dialup accounts I still get e-mails regularly through them.
Like Stuartli I also have a few old email accounts that I drag along with me from ISP to ISP. If you could keep the old one going that would solve your problem or if you prefer not to have more than one you could run both until your were sure that you had notified everyone that mattered.
Like others, I carried on using old PAYG dial-up email accounts (freeserve / tiscali in my case) after switching to broadband with another provider. With freeserve I need to dial in every 90 days to keep the accounts active, with Tiscali this isn't necessary.
In the end I binned the old freeserve account just 'cos of the volume of spam. Unfortunately it had been my main account for many many years and I had to go through the laborious process of notifying everybody. This involved:-
- Address Book - Reviewing old emails - Logging onto bank accounts, amazon etc. (if you don't have emails from people or you don't log in to accounts where you have registered ann address, surely they can't be that important)
You'll find all the info. is there, it just takes time.
If your old ISP allows,and most do, just download your emails via your new ISP from your old POP mail boxes. Then as and when your contacts email you inform them of your new address. This is what I did.