you want a definitive answer - gmail is safe method of response.
or you want all angles, there were some reports in the past of gmail glitch where ip gets shown, if they were to dig deep in to html text, but this is only if they were looking out for you in particular, very unlikely..
an example is if I answer a question and it goes to memberxyz@ebay.com , I will then switch ip to answer a question under another account, just in case. This is only an issue if you are answering buyer queries before thy purchase, ie you havent got their email yet. Or say Ive been logged in to ebay under one ip, I may want to change ip before I answer a question thru gmail on another account.
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