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550 relaying denied for xxxx@yahoo.gr?

I have a SMF forum and I noticed that nearly all of the subscribers that never activate their account come from yahoo.?? e-mail addresses. one usual message error that I get as administrator is the following: xxxx@yahoo.gr SMTP error from remote mail server after RCPT TO:<xxxx@yahoo.gr>: host mx1.mail.eu.yahoo.com [217.12.11.64]: 550 relaying denied for <xxxx@yahoo.gr> I checked my ISP's mail server for being Spam blacklisted and I found no such evidence. Any ideas ??

Public Comments

1. Those are yahoo members probably who made their account for the purpose of chatting on Yahoo and they never verified their account to Yahoo either.. You will be asked to verify your address but you can do the Yahoo Messenger scene without doing so. You can join the chat rooms and IM without ever verifying the e-mail. Probably this is the reason why those IDs are active but not their e-mails.