It wont save you from your current predicament, but going forward I would suggest you use www.disguises.me. On the site you enter your real email address and then pick what you want your new email address to be.
So for example, say my real email is Squirrel@gmail.com. The new one could be Squirrel@disguises.me. Everyone you give your Disguises.Me email address to is automatically blacklisted. The only emails you get are once per day D.M sends you a digest of all emails sent to that address. You can whitelist the sender, preview a message, accept that message only, or do nothing. If you whitelist someone their subsequent emails automatically show up in your real email. No additional web mail to check, etc.
From the Disguises.Me site (run by friends)
How can I get setup?Use the form below to create an account. No password or personal information is necessary.
What is Disguises.Me? A tool designed to conceal your real email address with a new Disguises.Me email address. Instead of giving out your real email address, you can give out your new Disguises.Me address. Once you start using your Disguises.Me address, you have full control over who can send emails to you. If you want to stop getting emails from someone, you can remove them from your list of authorized contacts.
How does it work? Disguises.Me gives you a second email address that is different than your existing email address. By having two email addresses, one that you give out to people you trust and another one for people/companies you don't trust, you are able to take full control of your email box. Here is a graphicand a video of how it works.
Why does Disguises.Me work so well? The problem with your existing email box is that it allows people to send to you until you mark them as blocked. Disguises.Me blocks everyone by default and only allows authorized senders to give you email.
What does it cost you?It is free. In exchange for the service, Disguises.Me appends every email sent with an ad at the bottom. Ads are based on the sender's domain, the receiver's domain, the subject of the email, the body of the email, and your geographic area. Your email address is kept completely private from advertisers.