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Could this be a clue?
I sent that test email from my Comcast webmail to tonytonini.com when its MX record was pointed to 50webs and I never received it (as expected).
But once I changed the MX record back to godaddy's host, that failed email came through (to godaddy's mail server)!
I don't know routing that well, but Comcast failed to send the email to 50Webs (for some reason) but keeps trying. Would Comcast finding the new MX record in about an hour tell us anything? I guess Comcast SMTP keeps looking at DNS records since it came through to godaddy which was changed mid-sending.
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