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Step 1:
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Log in to the 1&1 Control Panel using your Customer ID OR domain name and your password
If you have only one package, you will land on the Administration page. If you have more than one package, select the package in question to reach its Administration page.

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Step 2:
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Click the Domains link from the Domains & Webspace panel.
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Step 3:
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Tick the box next to the domain to select it. Click the DNS button above the list of domains and select Show DNS Settings.
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Step 4:
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Click the Edit button next to Name Server Settings.
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Step 5:
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You will not be able to edit the MX record for your domain unless you are using the 1&1 name servers. If you are using a CNAME record or other DNS, you will not be able to make a change to the MX records within the 1&1 Control Panel and will need to make this change with your current DNS host.
Please note that mail server priority is usually set in multiples of 10 with the lowest number taking top priority (kind of like golf). You must enter at least two mail server addresses for the MX record.
Select Other mail server from the Advanced DNS Settings section.
Enter the first mail server address into the MX 1 / Prio text box followed by the mail server Priority in the second text box.
Enter the second mail server address into the MX 2 / Prio text box followed by the mail server Priority in the second text box.
Repeat for the third and fourth mail servers if needed although only two addresses are required.
Click the OK button to save your changes.
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Step 6:
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A confirmation page is displayed informing you that the changes will be updated accordingly. As with all DNS changes, it may take 24-48 hours until the change is recognized by all servers/computers on the Internet.
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