you may recieve a email saying the money has cleared, DO NOT BELIEVE IT!, make sure that the money is in your account first as the email can be spoofed. Also I'm not to sure about an echeque any way.
If it were me I would refuse the sale and complain to ebay. It just sounds a little iffy, buying by proxy/ paying by an unusual & unaccepted method.
Is it a sale to some one in the UK?
Could the "friends" account be a hacked account ?
If you do decide to go ahead, make sure you take enough time to be 100% sure you have the payment, perhaps contact your bank and ask if theres any way it can go tits up and at what point the payment is truly safe.
If he offers to pay into an escrow service, be very careful as there are many fake sites out there.
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