to unblock accidentally blocked e-mail, the user should locate the "settings" menu in his or her e-mail client, then access the list of blocked e-mail addresses and remove the address in question. depending on the e-mail client, the previously-blocked e-mails might appear in the inbox, deleted mail folder or junk (spam) mail folder.
here’s how to unblock an accidentally blocked sender in windows live mail and windows mail: get to junk e-mail options. in windows live mail, choose actions→junk e-mail→safety options. you may have to press the f10 key to expose the actions menu. in windows mail, choose tools→junk e-mail options. click the blocked senders tab.
unblock a blocked sender there might be other ways you're blocking email addresses through outlook.com, so be sure to read through all steps below to make sure you're opening your account enough to get mail from the recipient in question.
Block and unblock email addresses in Yahoo Mail | Yahoo
block and unblock email addresses in yahoo mail. make sure you're only getting emails from the people you want. yahoo mail lets you anonymously add up to 1000 email address to your blocked list, or remove them if you change your mind.
for more tips about how to make your password secure, see help protect your outlook.com email account. if you can't unblock your account. if you still can't unblock your account by entering the security code or changing your password, go to when you can't sign in to your microsoft account.
to unblock - select a blocked email address, and then select the trash can. more info about blocking and unblocking emails. when you block an email address, your at&t mail account automatically deletes messages sent to you from that account.