You can create a domain-specific "whitelist" to ensure that important clients and other contacts will never be blocked, even if they send you spam. Please keep your whitelist as small as possible to prevent allowing spam through. Whitelisting over 500 email addresses is not supported and should not be required.

Whitelisting by IP Address

1. Determine the IP address of the organization's mail server to be whitelisted.

   This can be done by examining the headers of e-mail messages from the organization. Or you can simply ask the administrator of their mail server for this information.

2. Click on "Edit" next to "Domain Whitelist".
3. Click on the "Create new entry" link.
4. Under "Whitelist Options", select "Whitelist by: IP Address" in the list box.
5. Enter the IP address of the mail server (in dotted decimal notation, ie. 123.123.123.123) in the "IP Address" text box under "Whitelist Arguments".

You can also specify "Comments" that will help you remember why this entry was created.

6. Click on the "Create" button to create the entry.

Whitelisting by Sender Email Address

1. Determine the sender's email address to be whitelisted.
2. Click on "Edit" next to "Domain Whitelist".
3. Click on the "Create new entry" link.
4. Under "Whitelist Options", select "Whitelist by: E-mail Address" in the list box.
5. Enter the email address in the "E-mail Address" text box under "Whitelist Arguments".

Optionally, you can allow all email addresses at a specific domain by specifying just the domain preceded by the at (@) symbol in the "E-mail Address" text box. For example, to allow all email from users at customer.com, you would enter:

@customer.com

You can also specify "Comments" that will help you remember why this entry was created.

6. Click on the "Create" button to create the entry.