Max. no of allowed "rcpt to" commands in a smtp session?

Hi All,
 
I couldn't find any information about max no of "rcpt to" commands
allowed in a single smtp session in rfc2821. It looks like there is
no limit defined for it. I don't wanna let any spammer to send
hundereds of mails in a single smtp session.So , what is the resonable
max number of "rcpt to" commands for a single smtp session?
  
Regards,
  


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