>my email address is dfroonj@optonline.net.
>
>if I change it to dfroonj@opton, save it, and send a message to it,
>the message never gets delivered but it tells me it got sent.
>
>
You can try filtering bad e-mail addresses - it still will not guarantee that seemingly OK e-mail addresses will work.
If it's not broken, fix it until it is.
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