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Was your credit card charged? That would give you an answer if they received it or not..
zechariah, not to worry! They get too many submissions to have editors respond to the credit card payments. It was undoubtedly an auto-responder response you received, and if you responded to that it would not have reached an editor. Auto-responders are not interactive.
Relax for the weekend and keep us posted. You're OK.
Tell them the last time you submitted an url, you received an email confirmation, and you didn't this time, and was there a problem with the submission? Tell them your credit card was charged, and give them your id number.
After, all, you are not mad, just concerned.
I wouldn't panic, sometimes systems hiccup and e-mails that are supposed to happen, just don't. It could be any number of things. I wouldn't be worried.
And I have sent thank you's to editors. They actually appreciate someone being nice to them instead of someone writing in to whine about a listing.
So, take it easy this weekend, and let us know how things go. :)