This message is sent to the local console to show that the sender’s mail was not successfully delivered because of a protocol Recoverable error. The SMTP server received the string, <CR><LF>.<CR><LF>, followed by additional data. The string, <CR><LF>.<CR><LF>, is used to specify the end of the data; thus, the client SMTP server is in error. The data is accepted, and the client SMTP server waits for an additional <CR><LF>.<CR><LF> string.