I have had trouble with my ipad deleting messages permanently. I usually use my laptop because the ipad interface is so clunky, and again, it does some really strange things to my mail at times

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I had an offer to sell me an 1871 PEI Penny in AU-MS condition that I wanted to respond to, but I can't find it. I even tagged it with a colored subject so I could find it, then my ipad deleted it.
I'm the sender will respond to this email.
Thanks.