Mac mail recipient rejected by server

Select the Primary Server at the top of the screen. Ensure that your username and password are entered into the appropriate spots, Use SSL is turned on and Authentication is set to Password. Click Done at the top of the screen and you should be good to go! Save Save. Web Services. Skip to main content. For a Microsoft Outlook version of this article, see For a Microsoft Outlook 98 version of this article, see For a Microsoft Outlook 97 version of this article, see When you send messages, you may receive an error message that your message cannot be sent because of Simple Mail Transfer Protocol SMTP relay blocking.

The exact error message may vary, depending on your Internet service provider ISP. However, it is similar to the following error message: The message could not be sent because one of the recipients was rejected by the server. This behavior affects all messaging clients, regardless of the manufacturer.

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To resolve this behavior, contact your ISP for help. The e-mail client does not cause this behavior. If the error message that is described in the "Symptoms" section of this article is random, it is possible that your SMTP server is checking whether the domain or the recipient name actually exists before sending the message.


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If the recipient's e-mail server is temporarily down or unavailable for another reason, such as high network volume, your SMTP server cannot verify the address and may reject the relay. In this case, action is not required.

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The message is sent when the receiving server is available again. More Information. SPAM is flooding the Internet with many copies of the same message in an attempt to send the message to people who would not otherwise choose to receive it. Most SPAM messages use an automated system to send commercial advertising, or mass marketing messages. SPAM costs the sender very little to send; most of the costs are paid for by the recipient or the e-mail providers.


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This affects users who receive messages with two different Internet addresses, but that want the same reply address on both e-mail accounts. A network administrator can configure the server so that if you first connect and authenticate with the POP3 email server, it will approve any request that you make to send an email message through the normally restricted SMTP outbound server.

You are trusted in that you have an account with the ISP with a user name and password. You are authorized to use the SMTP server to send email messages because you are a customer.

A remote user at an office can use this option. However, a major problem is that many places have what are called dynamic IP addresses.

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Each time that you connect, you're not assured of having the same IP address. Some companies might have a reserved block or range of IP addresses. Your ISP can provide additional information. There are many possible scenarios for relaying. The following are the most common situations. See if one matches your situation. You're at home and have an ISP account that ends with proseware. You send an email message to another person whose email address also ends with proseware.

Same as the first scenario, except that you send an email message to a person whose email address ends with adatum.

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Yes, but it is not blocked. You're at work. Your work email address ends with thephone-company.

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You send an email message to a person whose email address also ends with proseware. Same as the preceding scenario, except that you send an email message to a person whose email address ends in adatum. Yes, and this message could be blocked as relay mail. You're staying at a hotel or using an airport Internet kiosk that provides Internet access.

You have a home ISP account that ends with proseware. If you're using a scenario that is considered relay, you must send the message through your current connection's server. This means if you're at work or away from home and not using your ISP to connect to the Internet, and you want to send a message from your home ISP email account, you must change your email account settings to specify the SMTP server used at your location, for example, your work SMTP server.