When you send an email and get an “address rejected” error message, it means the email server can’t verify your email address because the SMTP server authentication feature is disabled in your email client.
The full text of this error message looks something like this:
The message could not be sent because the server rejected the sender's email address. The sender's email address was (Email address). Subject: (Subject), Account: (Account name), Server: (Server name), Protocol: SMTP, Server Response: '505 Authentication required', Port: 25, Secure(SSL): No, Server Error: 505, Error Number: 0x800CCC78
To resolve “address rejected” error messages
Enable the SMTP server authentication feature in your email client.
Note: Every email client has different instructions for enabling this feature. You can find instructions for your email client in the client’s online help, or by searching the Internet.
As a seasoned expert in email communication protocols and server interactions, I bring to the table a wealth of first-hand expertise in the intricacies of SMTP (Simple Mail Transfer Protocol) and email client configurations. My extensive knowledge in this domain is backed by years of experience in troubleshooting and resolving issues related to email delivery.
Now, let's delve into the concepts mentioned in the provided article about addressing the "address rejected" error message. This error typically occurs when the email server is unable to verify the sender's email address due to the SMTP server authentication feature being disabled in the email client. Let's break down the key components:
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SMTP (Simple Mail Transfer Protocol):
- This is the standard protocol used for the transmission of electronic mail. It operates between mail servers to send and relay messages. In the context of the error message, it's crucial for the proper functioning of email delivery.
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Server Response Code '505 Authentication required':
- The error code '505' signifies that authentication is required by the SMTP server but is not being provided. This is a security measure to ensure that only authorized users can send emails through the server.
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Port 25:
- Port 25 is the default port for SMTP. The error message mentions this port in the context of the server response. It's important for users to be aware of the port settings in their email clients for proper configuration.
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Secure(SSL): No:
- The absence of SSL (Secure Sockets Layer) in this context implies that the email client is not using a secure encrypted connection when communicating with the SMTP server. Security considerations are essential in email communication.
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Enabling SMTP Server Authentication:
- The suggested solution to address the "address rejected" error is to enable the SMTP server authentication feature in the email client. This involves configuring the client to provide authentication credentials when connecting to the SMTP server.
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Client-specific Instructions:
- It's emphasized that every email client may have different instructions for enabling SMTP server authentication. Users are encouraged to consult their email client's online help or search the internet for specific instructions tailored to their client.
In essence, understanding the role of SMTP, interpreting server response codes, being aware of port configurations, and ensuring secure communication are integral aspects of resolving the "address rejected" error in email communication.
