Reason
Within the current transaction the recipient limit has been reached and the connection has therefore been rejected with a temporary error.
Solution
If you receive a temporary error during a transaction, please close the connection, then re-establish it and restart the affected transaction.
Please note that our current recipient limit is 20 within a transaction, that is 20 RCPT TO per one MAIL FROM . Within a session, 100 transactions can be carried out before the connection has to be re-established.
If your mail system takes these limits into account, you should no longer experience temporary rejections. Please configure your system accordingly.
You should expect that this value may change. No exceptions or individual limit changes will be made.