Use the RCPTREPLY452 statement to cause the SMTP client to interpret the 452 reply code being received on the RCPT command as 'too many recipients'. Note that the SMTP client continues to handle the 552 reply code as 'too many recipients' also.
If this statement is not present, the SMTP client interprets the 452 reply code as 'insufficient system storage', and the mail processing is halted.
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RCPTREPLY452