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What was the mistake? Did you forget the memo? - in that case contact Bittrex for support.

@thecryptofiend mistaken addresses ... SBD sent to the address of STEAM and did not make it. Because bittrex does not support the SBD only steem

The only way to fix it is to contact the owner of the wallet for that address and ask for it back.

no that's probably lost .... f**k: (((((((((((((because the address supports bittrex but steem so I probably will not happen

Actually Bittrex does have Steem Dollars. Try contacting them and see if they can help.