How can i say "I am excited to hear from you" in a casual way?

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I basically agree with Matsu but I suppose OP's asking for it in "the casual style" not in "the polite style (丁寧体)" so I'd write it as

連絡もらえてうれしい(+よ)
or
連絡くれてうれしい(+よ)

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I left out the subject わたしは, the particle を after 連絡, and あなたから(from you) or あなたが(you) as the subject for the くれて.

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（私は）あなたから連絡をもらえてうれしいです。

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@hana It's "I'm excited to HEAR FROM you", not "I'm excited to hear that" or "I'm excited to hear you say that".

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え、まじ？　うれしい！
It's a casual way.