If your e-mail is on a black list, it means that it has been blocked by a person or a program. Blacklists are created for personal use and are also created to preserve privacy, so it can be difficult to find out if your e-mail address is on a blacklist. However, there are some things that you can try to see if your e-mail address has been blacklisted.
Send an e-mail to the account that you feel your e-mail address is on a blacklist for. If it bounces, you know that there is something wrong with the email. You should get a message back saying your e-mail was undeliverable, or that the server timed out, or some other type of message saying your e-mail did not arrive.
Send an e-mail to the same account from another e-mail address, even if you have to create a free e-mail like Hotmail or Gmail, to do this. If this e-mail also comes back, it probably means that there is something wrong with the email account. However, if this e-mail does not come back, there is a good chance that the email address you used first is on a blacklist or has been blocked.
Contact the person in another way, such as on the phone or in person, to ask them if they have blacklisted you. It might have been an accident, and they can rectify the problem.