E-mail users can block e-mail addresses, which means that they won't get e-mails from those addresses. If your e-mail address is blocked by a user, a group or a site, you'll want to know about it so you can make other arrangements to contact someone. There are several ways to tell if your e-mail address has been blocked.
Send an e-mail to the person, group server or site that you believe has blocked you.
Wait to see if the email bounces. If it does, you will get a message back saying that the email was undeliverable. You might also get a message that says there was a server error, or that the email address you sent a message to does not exist.
Attempt to send an e-mail to another address, just to be sure that your e-mail account is functioning and allowing you to send messages. If this e-mail goes through, you know the problem is with the particular place that might have blocked you.
Try to send an e-mail to the address in question using another e-mail account, even if you have to make a free account at Hotmail or Gmail. If this e-mail goes through, you know there is a problem with your original e-mail address.
Contact the person, group, or site with another e-mail, by phone or in person and ask if they have blocked you. It could be that they did so unintentionally. It could also be that there is a problem with your e-mail account.