using grep on /var/log/mail.log trying to escpae an "-"

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Autor: Jim
Data:  
Para: PLUG
Asunto: using grep on /var/log/mail.log trying to escpae an "-"
I am using grep and tyring to escape an - and I want everying returned
that is 6.3 to 6.9

I tried something like this

grep "-"6.3* /var/log/mail.log |grep Hits

and I get


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