We our currently sending mail from our office through are ISP's outgoing mail server (Verizon) through a dynamic IP. However lately we are receving alot of bounce backs with the error "SMTP:550 Too many invalid recipients" I have googled on the error but have not found to much on it. Can anybody explain exactly what this message means, below is an example of some of the bounce backs we have been receiving.
"Your message cannot be delivered to the following recipients:
Recipient address: email@example.com
Reason: Rejection greeting returned by server.
Diagnostic code: smtp;550 Too many invalid recipients
Remote system: dns;mga01.intel.com
(TCP|188.8.131.52|46829|184.108.40.206|25) (Too many invalid recipients)"