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Can you clarify--------do you mean the domain you are sending to is not recognized? Exactly what does the error message say?
502 series errors indicate an issue between two or more servers on the internet. This is beyond your control. However, there are a number of things you can try to fix it yourself. Here is a really good article that explains the errors and some possible fixes---------------------
A couple of the things they suggest-------------------
Try clearing out your browser's cache/browsing history. When you have done that, close out the browser and re-start it in a fresh session. If that doesn't do it, then try using a different browser.