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The email address is good. I'm unsure why an OS would reject a properly-formatted SMTP address. A server, yes; an OS?
What specifically is the problem? Your connection to Cox or your wireless LAN? What do you measure directly connected to the gateway? I'm unsure about Pods but I'm sure there's something better.
What are your modem's signal levels?
duvel said:our email program could not send it because the address "firstname.lastname@example.org"
If the email isn't working try on Twitter at @CoxHelp, visit them on Facebook.