pipelining problem exim4 or MS?

Hi,

I'm having a problem delivering to a certain host.
Looks like the problem might be pipelining related.
I've seen my share of bugs in MS ESMTP implemtations but this time I'm not
sure it's 'them'.

This is exim 4.50 on a debian machine (package)

If someone could look at the TCP dump below and help me figure out where
the problem lies. Thnx.

greeting ehlo and response:

12:13:52.361374 IP mail.gerrithendriks.nl.smtp > smtp-out3.tiscali.nl.37571: P 1:123(122) ack 1 win 65535 <nop,nop,timestamp 16965449
0x0000: 4500 00ae 20c4 0000 7c06 7688 52a9 40b1 E.......|.v.R.@.
0x0010: c3f1 4fb2 0019 92c3 620a 01f2 71e8 70a0 ..O.....b...q.p.
0x0020: 8018 ffff 51d9 0000 0101 080a 0102 df49 ....Q..........I
0x0030: 9c57 3bfe 3232 3020 6765 7272 6974 6865 .W;.220.gerrithe
0x0040: 6e64 7269 6b73 2e6c 6f63 616c 204d 6963 ndriks.local.Mic
0x0050: 726f 736f 6674 2045 534d 5450 204d 4149 rosoft.ESMTP.MAI
0x0060: 4c20 5365 7276 6963 652c 2056 6572 7369 L.Service,.Versi
0x0070: 6f6e 3a20 362e 302e 3337 3930 2e31 3833 on:.6.0.3790.183
0x0080: 3020 7265 6164 7920 6174 2020 5468 752c 0.ready.at..Thu,
0x0090: 2032 3920 5365 7020 3230 3035 2031 323a .29.Sep.2005.12:
0x00a0: 3133 3a33 3620 2b30 3230 3020 0d0a 13:36.+0200...
12:13:52.361382 IP smtp-out3.tiscali.nl.37571 > mail.gerrithendriks.nl.smtp: . ack 123 win 1460 <nop,nop,timestamp 2622962708 16965449
0x0000: 4500 0034 4b65 4000 4006 4861 c3f1 4fb2 E..4Ke@.@.Ha..O.
0x0010: 52a9 40b1 92c3 0019 71e8 70a0 620a 026c R.@.....q.p.b..l
0x0020: 8010 05b4 3778 0000 0101 080a 9c57 3c14 ....7x.......W<.
0x0030: 0102 df49 ...I
12:13:52.361446 IP smtp-out3.tiscali.nl.37571 > mail.gerrithendriks.nl.smtp: P 1:28(27) ack 123 win 1460 <nop,nop,timestamp 2622962708
0x0000: 4500 004f 4b67 4000 4006 4844 c3f1 4fb2 E..OKg@.@.HD..O.
0x0010: 52a9 40b1 92c3 0019 71e8 70a0 620a 026c R.@.....q.p.b..l
0x0020: 8018 05b4 a73f 0000 0101 080a 9c57 3c14 .....?.......W<.
0x0030: 0102 df49 4548 4c4f 2073 6d74 702d 6f75 ...IEHLO.smtp-ou
0x0040: 7433 2e74 6973 6361 6c69 2e6e 6c0d 0a t3.tiscali.nl..
12:13:52.375716 IP mail.gerrithendriks.nl.smtp > smtp-out3.tiscali.nl.37571: P 123:437(314) ack 28 win 65508 <nop,nop,timestamp 169654
0x0000: 4500 016e 20c5 0000 7c06 75c7 52a9 40b1 E..n....|.u.R.@.
0x0010: c3f1 4fb2 0019 92c3 620a 026c 71e8 70bb ..O.....b..lq.p.
0x0020: 8018 ffe4 edff 0000 0101 080a 0102 df49 ...............I
0x0030: 9c57 3c14 3235 302d 6765 7272 6974 6865 .W<.250-gerrithe
0x0040: 6e64 7269 6b73 2e6c 6f63 616c 2048 656c ndriks.local.Hel
0x0050: 6c6f 205b 3139 352e 3234 312e 3739 2e31 lo.[195.241.79.1
0x0060: 3738 5d0d 0a32 3530 2d54 5552 4e0d 0a32 78]..250-TURN..2
0x0070: 3530 2d53 495a 450d 0a32 3530 2d45 5452 50-SIZE..250-ETR
0x0080: 4e0d 0a32 3530 2d50 4950 454c 494e 494e N..250-PIPELININ
0x0090: 470d 0a32 3530 2d44 534e 0d0a 3235 302d G..250-DSN..250-
0x00a0: 454e 4841 4e43 4544 5354 4154 5553 434f ENHANCEDSTATUSCO
0x00b0: 4445 530d 0a32 3530 2d38 6269 746d 696d DES..250-8bitmim
0x00c0: 650d 0a32 3530 2d42 494e 4152 594d 494d e..250-BINARYMIM
0x00d0: 450d 0a32 3530 2d43 4855 4e4b 494e 470d E..250-CHUNKING.
0x00e0: 0a32 3530 2d56 5246 590d 0a32 3530 2d58 .250-VRFY..250-X
0x00f0: 2d45 5850 5320 4753 5341 5049 204e 544c -EXPS.GSSAPI.NTL
0x0100: 4d20 4c4f 4749 4e0d 0a32 3530 2d58 2d45 M.LOGIN..250-X-E
0x0110: 5850 533d 4c4f 4749 4e0d 0a32 3530 2d41 XPS=LOGIN..250-A
0x0120: 5554 4820 4753 5341 5049 204e 544c 4d20 UTH.GSSAPI.NTLM.
0x0130: 4c4f 4749 4e0d 0a32 3530 2d41 5554 483d LOGIN..250-AUTH=
0x0140: 4c4f 4749 4e0d 0a32 3530 2d58 2d4c 494e LOGIN..250-X-LIN
0x0150: 4b32 5354 4154 450d 0a32 3530 2d58 4558 K2STATE..250-XEX
0x0160: 4348 3530 0d0a 3235 3020 4f4b 0d0a CH50..250.OK..

Mail from, rcpt to & data

12:13:52.375797 IP smtp-out3.tiscali.nl.37571 > mail.gerrithendriks.nl.smtp: P 28:123(95) ack 437 win 1728 <nop,nop,timestamp 2622962722 16965449>
0x0000: 4500 0093 4b69 4000 4006 47fe c3f1 4fb2 E...Ki@.@.G...O.
0x0010: 52a9 40b1 92c3 0019 71e8 70bb 620a 03a6 R.@.....q.p.b...
0x0020: 8018 06c0 a783 0000 0101 080a 9c57 3c22 .............W<"
0x0030: 0102 df49 4d41 494c 2046 524f 4d3a 3c62 ...IMAIL.FROM:<b
0x0040: 7573 696e 6573 732d 7375 7070 6f72 7440 usiness-support@
0x0050: 6e6c 2e74 6973 6361 6c69 2e63 6f6d 3e20 nl.tiscali.com>.
0x0060: 5349 5a45 3d31 3238 380d 0a52 4350 5420 SIZE=1288..RCPT.
0x0070: 544f 3a3c 696e 666f 4067 6572 7269 7468 TO:<info@gerrith
0x0080: 656e 6472 696b 732e 6e6c 3e0d 0a44 4154 endriks.nl>..DAT
0x0090: 410d 0a A..

Other side acks mail from:

12:13:52.386771 IP mail.gerrithendriks.nl.smtp > smtp-out3.tiscali.nl.37571: P 437:493(56) ack 123 win 65413 <nop,nop,timestamp 16965449 2622962722>
0x0000: 4500 006c 20c6 0000 7c06 76c8 52a9 40b1 E..l....|.v.R.@.
0x0010: c3f1 4fb2 0019 92c3 620a 03a6 71e8 711a ..O.....b...q.q.
0x0020: 8018 ff85 e3e5 0000 0101 080a 0102 df49 ...............I
0x0030: 9c57 3c22 3235 3020 322e 312e 3020 6275 .W<"250.2.1.0.bu
0x0040: 7369 6e65 7373 2d73 7570 706f 7274 406e siness-support@n
0x0050: 6c2e 7469 7363 616c 692e 636f 6d2e 2e2e l.tiscali.com...
0x0060: 2e53 656e 6465 7220 4f4b 0d0a .Sender.OK..

Other side acks rcpt to & data:

12:13:52.436489 IP mail.gerrithendriks.nl.smtp > smtp-out3.tiscali.nl.37571: P 493:574(81) ack 123 win 65413 <nop,nop,timestamp 16965449 2622962773>
0x0000: 4500 0085 20c7 0000 7c06 76ae 52a9 40b1 E.......|.v.R.@.
0x0010: c3f1 4fb2 0019 92c3 620a 03de 71e8 711a ..O.....b...q.q.
0x0020: 8018 ff85 78fc 0000 0101 080a 0102 df49 ....x..........I
0x0030: 9c57 3c55 3235 3020 322e 312e 3520 696e .W<U250.2.1.5.in
0x0040: 666f 4067 6572 7269 7468 656e 6472 696b fo@gerrithendrik
0x0050: 732e 6e6c 200d 0a33 3534 2053 7461 7274 s.nl...354.Start
0x0060: 206d 6169 6c20 696e 7075 743b 2065 6e64 .mail.input;.end
0x0070: 2077 6974 6820 3c43 524c 463e 2e3c 4352 .with.<CRLF>.<CR
0x0080: 4c46 3e0d 0a LF>..

This last packet is never acknowledged and so we receive this last packet
over and over untill exim finally quits and logs a timeout.

As far as I can tell everything looks good to me. I can't see anything
that is not allowed or malformed or whatever...

Can anyone see something that's gooing wrong? Or it an exim4 bug?

Regards,
Mark.