# CHUNKING transmission, short messages, PIPELINING # # Pipelined cases # # Basic short message server PORT_S 220 Greetings EHLO 250-Hello there 250-PIPELINING 250 CHUNKING MAIL FROM RCPT TO BDAT 345 LAST *data 345 250 OK mail 250 OK rcpt 250 OK bdat QUIT 225 OK *eof **** sudo exim -odf -bS EHLO test MAIL FROM: RCPT TO: DATA Subject: foo data . QUIT **** # # Error case: server wrongly expected more data, client gets timeout for data-ack # XXX This is a problem with data/quit pipelining. The succeeding SMTP command cannot # be distinguished from the data, by the errroneous server. # Of course, we could avoid such pipelining on the client side, when BDAT is used. # But - is this any worse than a server failing to spot the data-dot under DATA? # I think not; both are culpable, and there is only so much the client can do. #server PORT_S #220 Greetings #EHLO #250-Hello there #250-PIPELINING #250 CHUNKING #MAIL FROM #RCPT TO #BDAT 345 LAST #*data 346 #250 good mail cmd #**** #sudo exim -odf -bS #EHLO test #MAIL FROM: #RCPT TO: #DATA #Subject: foo # #data #. #QUIT #**** # # Error case: server wrongly expected less data # client get the data-ack, sends quit - but server # sees a munged quit due to the outstanding data tail server PORT_S 220 Greetings EHLO 250-Hello there 250-PIPELINING 250 CHUNKING MAIL FROM RCPT TO BDAT 345 LAST *data 344 250 OK mail 250 OK rcpt 250 OK bdat QUIT 225 OK **** sudo exim -odf -bS EHLO test MAIL FROM: RCPT TO: DATA Subject: foo data . QUIT **** # # server rejects MAIL cmd # transport coding does not handle the possible RSET-and-another transaction, # but always QUITs server PORT_S 220 Greetings EHLO 250-Hello there 250-PIPELINING 250 CHUNKING MAIL FROM RCPT TO BDAT 345 LAST *data 345 550 unacceptable mail-from 550 rcpt ungood lacking mail-from 500 bdat ungood lacking mail-from QUIT 225 OK **** sudo exim -odf -bS EHLO test MAIL FROM: RCPT TO: DATA Subject: foo data . QUIT **** # # server tmp-rejects MAIL cmd server PORT_S 220 Greetings EHLO 250-Hello there 250-PIPELINING 250 CHUNKING MAIL FROM RCPT TO BDAT 346 LAST *data 346 450 greylisted mail-from 550 rcpt ungood lacking mail-from 500 bdat ungood lacking mail-from QUIT 225 OK **** sudo exim -odf -bS EHLO test MAIL FROM: RCPT TO: DATA Subject: foo data . QUIT **** # # server rejects RCPT cmd server PORT_S 220 Greetings EHLO 250-Hello there 250-PIPELINING 250 CHUNKING MAIL FROM RCPT TO BDAT 345 LAST *data 345 250 OK mail 550 no such recipient 500 oops bdat QUIT 225 OK **** sudo exim -odf -bS EHLO test MAIL FROM: RCPT TO: DATA Subject: foo data . QUIT **** # # server rejects RCPT cmd, and immediately drops the TCP conn sudo rm DIR/spool/db/retry exim -bd -DSERVER=server -DRETRY2 -DSRV=tls -oX PORT_S **** sudo exim -DRETRY2 -odf -bS EHLO test MAIL FROM: RCPT TO: DATA Subject: foo BigHeader_500: 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 12345 BigHeader_500: 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 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QUIT **** killdaemon # # server rejects BDAT cmd server PORT_S 220 Greetings EHLO 250-Hello there 250-PIPELINING 250 CHUNKING MAIL FROM RCPT TO BDAT 345 LAST *data 345 250 OK mail 250 OK rcpt 500 oops bdat QUIT 225 OK **** sudo exim -odf -bS EHLO test MAIL FROM: RCPT TO: DATA Subject: foo data . QUIT **** # # server tmp-rejects BDAT cmd server PORT_S 220 Greetings EHLO 250-Hello there 250-PIPELINING 250 CHUNKING MAIL FROM RCPT TO BDAT 345 LAST *data 345 250 OK mail 250 OK rcpt 400 not right now bdat QUIT 225 OK **** sudo exim -odf -bS EHLO test MAIL FROM: RCPT TO: DATA Subject: foo data . QUIT **** # # no_msglog_check