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Can you please provide me with the ip address ranges for email sent on my behalf so I can adjust my SPF record with my DNS registrar?

The best way to accomplish this is to use an "include" statement in your SPF record. This way, if we ever change our IP addresses for any reason, you won't need to update any of your SPF settings. This is the same thing google does. Here is an example from our spf record, of how it will look:

[dpeters@web1 ~]$ dig +noall +answer txt;60ITX"v=spf1 ip4: ~all"
[dpeters@web1 ~]$

Be sure to include the following in your SPF record from the above example:

(Please note that there is an underscore in the hostname, and there is no space between the colon and the underscore.)