Recoverable error.
This message is returned to the mail client from the local host when the mail server has detected that too many recipients are being processed on a single note. The recipient commands (RCPT TO) that receive this reply will not be processed by the mail server. SMTP protocol dictates that SMTP client should resend these recipients at a later time. Meanwhile, the SMTP client can continue with the DATA command for recipients that were received successfully.
SMTP continues.
Notify owner of remote SMTP client of the problem.
SMTPCMDS
DoRcpt