(most) email to some mailservers get's delayed

L.S.
Email send from our GW 7.0.3 email system to (at least one) external email system (microsoft) get's delayed up to 24 / 48 hours.
I managed to make some traces and discovered the following:
<bad server>
very small email, (one smtp-data packet) get's send inmediately
bigger email's (multi-packet data) get delayed.
Tracing these bigger email's, all SMTP-DATA packet's up until the last get send within micro-seconds. Then there is a 0.2-0.3 second pause and the receiving email-server starts asking "when the hell the rest of the data is comming".
The greeting of this server:
250-smtp1.domain.nl Hello [...]
250-SIZE 26214400
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-AUTH LOGIN
250-8BITMIME
250-BINARYMIME
250 CHUNKING
</bad mail server>
<some other email server>
I've checked some other send email and all smtp-data packets get send tight away. The greeting of one of these (microsoft) email servers:
250-xyz.domain.local Hello []
250-SIZE
250-PIPELINING
250-AUTH NTLM
250 8BITMIME
</other mailserver>
So I'm suggesting the problem is a groupwise gwia reaction on one of these messages:
250-SIZE 26214400
250-DSN
250-ENHANCEDSTATUSCODES
250-AUTH LOGIN
250-BINARYMIME
250 CHUNKING
Which one, and how do I stop our server from waiting with the last SMTP-DATA packet?
Thomas Roes

I can send you the pcap file, No. Time Source 1 0.000000 192.168.100.242 2 0.015110 193.176.223.6 3 0.015125 192.168.100.242 4 0.030234 193.176.223.6 8 0.078865 192.168.100.242 10 0.106006 192.168.100.242 11 0.134803 193.176.223.6 12 0.134845 192.168.100.242 13 0.149954 193.176.223.6 14 0.149978 192.168.100.242 36 0.325376 193.176.223.6 37 0.325432 192.168.100.242 38 0.339141 193.176.223.6 39 0.339184 192.168.100.242 40 0.629948 193.176.223.6 41 0.629970 192.168.100.242 42 0.643679 193.176.223.6 43 0.737818 192.168.100.242 44 1.726490 192.168.100.242 45 3.758779 192.168.100.242 46 7.713395 192.168.100.242 47 15.732566 192.168.100.242 48 31.717503 192.168.100.242 49 60.650729 193.176.223.6 50 60.650746 192.168.100.242 51 60.651112 193.176.223.6 52 60.651123 192.168.100.242 53 63.682833 192.168.100.242 54 127.726176 192.168.100.242 81 180.659346 193.176.223.6 Packet 41 (DATA-fragment) Thomas Roes but for now.....
Destination Protocol Info
193.176.223.6 TCP 52783 > smtp [SYN] Seq=0 Win=6144 Len=0 MSS=1460 WS=1
192.168.100.242 TCP smtp > 52783 [SYN, ACK] Seq=0 Ack=1 Win=1460 Len=0
193.176.223.6 TCP 52783 > smtp [ACK] Seq=1 Ack=1 Win=6144 Len=0
192.168.100.242 SMTP S: 220 smtp1.ssonet.nl Microsoft ESMTP MAIL Service ready at Fri, 14 May 2010 10:30:26 +0200
193.176.223.6 TCP 52783 > smtp [ACK] Seq=1 Ack=92 Win=6053 Len=0
193.176.223.6 SMTP C: EHLO mail.leeuwendaal.nl
192.168.100.242 SMTP S: 250-smtp1.ssonet.nl Hello [77.242.121.13] | 250-SIZE 26214400 | 250-PIPELINING | 250-DSN | 250-ENHANCEDSTATUSCODES | 250-AUTH LOGIN | 250-8BITMIME | 250-BINARYMIME | 250 CHUNKING
193.176.223.6 SMTP C: MAIL FROM:<[email protected]> SIZE=1647
192.168.100.242 SMTP S: 250 2.1.0 Sender OK
193.176.223.6 SMTP C: RCPT TO:<[email protected]>
192.168.100.242 SMTP S: 250 2.1.5 Recipient OK
193.176.223.6 SMTP C: DATA
192.168.100.242 SMTP S: 354 Start mail input; end with <CRLF>.<CRLF>
193.176.223.6 SMTP C: DATA fragment, 1460 bytes
192.168.100.242 SMTP [TCP Retransmission] S: 354 Start mail input; end with <CRLF>.<CRLF>
193.176.223.6 IMF from: "Thomas Roes" <[email protected]>, subject: test email ivm vertraagde aflevering email, (text/plain) (text/html)
192.168.100.242 TCP [TCP Dup ACK 40#1] smtp > 52783 [ACK] Seq=355 Ack=113 Win=65280 Len=0 SLE=107838178 SRE=107838368
193.176.223.6 SMTP [TCP Retransmission] C: DATA fragment, 1460 bytes
193.176.223.6 SMTP [TCP Retransmission] C: DATA fragment, 1460 bytes
193.176.223.6 SMTP [TCP Retransmission] C: DATA fragment, 1460 bytes
193.176.223.6 SMTP [TCP Retransmission] C: DATA fragment, 1460 bytes
193.176.223.6 SMTP [TCP Retransmission] C: DATA fragment, 1460 bytes
193.176.223.6 SMTP [TCP Retransmission] C: DATA fragment, 1460 bytes
192.168.100.242 SMTP S: 451 4.7.0 Timeout waiting for client input
193.176.223.6 TCP 52783 > smtp [ACK] Seq=1763 Ack=399 Win=7604 Len=0
192.168.100.242 TCP smtp > 52783 [FIN, ACK] Seq=399 Ack=113 Win=65280 Len=0
193.176.223.6 TCP 52783 > smtp [ACK] Seq=1763 Ack=400 Win=7603 Len=0
193.176.223.6 SMTP [TCP Retransmission] C: DATA fragment, 1460 bytes
193.176.223.6 SMTP [TCP Retransmission] C: DATA fragment, 1460 bytes
192.168.100.242 TCP smtp > 52783 [RST, ACK] Seq=400 Ack=113 Win=0 Len=0
ends in mid-sentence.

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(most) email to some mailservers get's delayed

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