![]() ![]() ![]() You are required to provide a user name and password to access your mailbox. Require that you connect to the ISP POP3 (incoming) email server first When you connect to retrieve your new email messages, you typically connect to a POP3 (incoming) email server. Usually, these are the same user name and password used for the POP3 server but they can be unique. Require SMTP authentication Just as you must use a password to access your POP3 (incoming) server for your email messages, this option requires that you provide a user name and password to send email messages through the SMTP server. There are several types of restrictions in use today: Now, only the employees are permitted to use that phone. Think of it like this: a telephone in the lobby of your organization used to be available for anyone to use whether they worked at your organization or not. These restrictions help prevent just anyone from using or abusing an email server. ISP restrictions on relay email messagesĪs junk email volumes increased, network administrators - the people responsible for managing your ISP servers - began placing restrictions on their SMTP email servers. ![]() Under a so-called open relay server, there were no restrictions on who was allowed to send via the SMTP server. Under this system, anyone, anywhere could submit an email message to an SMTP server, and the server would accept it and forward it to a recipient or to another email server where the recipient's mailbox was located. Until recently, most SMTP email servers worked on an open trust system. This makes the junk email appear to come from the site that relays the message and conceals the identity of the real sender. Spammers use the relaying ability of SMTP servers to mask the true origin of junk email by relaying it through third-party servers that permit such open relays. The basic structure of the Internet was designed before anyone considered the implications of providing the ability to send millions of pieces of junk email for little cost. The main reason that junk email continues to increase in volume is that it costs the person who sends it virtually nothing to send in fact, the senders don't even have to send the junk email through the SMTP (outgoing) email server of their own ISP. 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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