# mail_4xx, rcpt_4xx, data_4xx, lost_connection need_ipv4 # MAIL, no pipelining # server PORT_S 220 Server ready EHLO 250-server id 250 OK MAIL FROM 452 temporary error QUIT 250 OK **** exim -odi userx@x.y **** dump retry sudo rm DIR/spool/db/* # RCPT, no pipelining # server PORT_S 220 Server ready EHLO 250-server id 250 OK MAIL FROM 250 OK RCPT TO 452 temporary error QUIT 250 OK **** exim -odi userx@x.y **** dump retry # DATA start, no pipelining # server PORT_S 220 Server ready EHLO 250-server id 250 OK MAIL FROM 250 OK RCPT TO 250 OK DATA 452 temporary error QUIT 250 OK **** exim -odi userx@x.y **** # DATA end, no pipelining # server PORT_S 220 Server ready EHLO 250-server id 250 OK MAIL FROM 250 OK RCPT TO 250 OK DATA 352 GO AHEAD . 452 temporary error QUIT 250 OK **** exim -odi userx@x.y **** # MAIL, pipelining # server PORT_S 220 Server ready EHLO 250-server id 250-PIPELINING 250 OK MAIL FROM 452 temporary error QUIT 250 OK **** exim -odi userx@x.y **** # RCPT, pipelining # server PORT_S 220 Server ready EHLO 250-server id 250-PIPELINING 250 OK MAIL FROM 250 OK RCPT TO 452 temporary error QUIT 250 OK **** exim -odi userx@x.y **** # DATA start, pipelining # server PORT_S 220 Server ready EHLO 250-server id 250-PIPELINING 250 OK MAIL FROM 250 OK RCPT TO 250 OK DATA 452 temporary error QUIT 250 OK **** exim -odi userx@x.y **** # DATA end, pipelining # server PORT_S 220 Server ready EHLO 250-server id 250-PIPELINING 250 OK MAIL FROM 250 OK RCPT TO 250 OK DATA 352 GO AHEAD . 452 temporary error QUIT 250 OK **** exim -odi userx@x.y **** # lost connection # server PORT_S 220 Server ready EHLO 250-server id 250-PIPELINING 250 OK MAIL FROM 250 OK RCPT TO **** exim -odi userx@x.y ****