Delivery failure notification at croc.ru croc.ru<[email protected]%213.247.247.51%195.38.23.65%>: Sorry, no SMTP connection got far enough; most progress: RCPT TO response; remote host 213.247.247.51 said: 550 Mail for [email protected] refused . (#5.5.0) (MXes tried: 213.247.247.51 said 550 for RCPT TO response; 195.38.23.65 said 550 for RCPT TO response.) --- Enclosed is a copy of the message.