In how many ways can I reply to ciao?

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I just got an email from abroad colleague and he said ciao at the end of letter. This remind me of another time, when a hansome man met me in a bar, as well as his beautiful girlfriend,and then he wrote a email to me and use bella ciao to express farewell. I am going to copy this express this time, fortunately I found out that bella means beauty for colleague is he. So I reply with 'thank ciao for now' instead. Is this a good salutation or behind the times? what will u say if someone else greet u with ciao? the more ways u told me, the more appreciation I take for u.