Unsolicited commercial email is sometimes called junk mail or spam. Note: Web email systems similar to Windows Live Mail and Yahoo! Mail are used differently, and this topic does not apply to those email accounts. When you use an email program, such as Outlook, that lets you store your email messages on your computer, you need access to an SMTP server to send email messages. SMTP is the protocol (standards that computers use to communicate with each other) that most email servers use to send email messages across the Internet. Your message was rejected because the SMTP (outgoing) email server did not recognize you as an authorized user. In these cases, your message might appear to be sent normally - it leaves your Outlook Outbox and appears in your Sent Items - but it's never actually delivered to the recipient. Some ISPs might not return an error message when they detect outgoing messages as unsolicited commercial email. The exact error message might vary, depending on your Internet service provider (ISP). Subject '', Account: '', Server: '', Protocol: SMTP, Server Response: '553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)', Port: 25, Secure(SSL): No, Server Error: 553, Error Number: 0x800CCC79." ![]() "The message could not be sent because one of the recipients was rejected by the server. Relaying Denied', Port: 25, Secure (SSL): No, Server Error: 550, Error Number: 0x800CCC79." ![]() Subject: '', Account: '', Server: '', Protocol: SMTP, Server Response: '550. When you send an email message that encounters a relay error, your SMTP (outgoing) email server might return your email message with an error message such as one of the following: The SMTP server must connect to another SMTP server to relay the message. Relaying occurs when an email message is sent to an email address whose domain (the name after the symbol, such as ) is not processed by the Simple Mail Transfer Protocol (SMTP) or outgoing server that the sender is requesting to deliver the message. The same situation could occur when you're away from your office and try to send an email message using your work email account. ![]() When you're away from home and send an email message using your home email account, your email message might be returned with a 550, 553, or relay-prohibited error message.
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