max_recipients_per_connection — maximum number of recipients to send on a connection
Max_Recipients_Per_Connection = 0
If set to
0 (the default), then no maximum limit will be enforced, otherwise, it specifies the maximum number of RCPT TO commands that can be used on a given connection. This is similar to
Max_Deliveries_Per_Connection but takes into account multi-recipient outbound mail.
max_recipients_per_connection is valid in the binding, binding_group, domain, listener, listen and global scopes.