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What is the Relaying Denied Error?

Mail sent to any domains that have been added to your server package will be directed to your 1&1 Dedicated Server. If the SMTP port is open and allows traffic, you may receive an error when attempting to send an E-mail to another address. This is due to the default setting of the mail server, that rejects mail unless a valid E-mail account and password are used to send the communication.

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