10.5 - 10.6.2: Postfix not accepting e-mails from certain hosts

Hi
Two days ago we migrated our server from 10.5 Server to a new Mac mini server running 10.6.2 server.
We are now facing the problem that postfix refuses to accept incoming e-mails from most hosts. Some hosts seem to be able to get through, but so far we haven't be able to identify a pattern.
The transfers just times out with various error messages. Below is one of the shorter transscripts. Any ideas where to start looking?
Feb 5 18:36:12 www postfix/smtpd[34067]: connect from pluto2-mail.kagi.com[67.134.14.166]
Feb 5 18:36:12 www postfix/smtpd[34067]: setting up TLS connection from pluto2-mail.kagi.com[67.134.14.166]
Feb 5 18:36:13 www postfix/smtpd[34067]: Anonymous TLS connection established from pluto2-mail.kagi.com[67.134.14.166]: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)
Feb 5 18:36:14 www postfix/smtpd[34067]: 42ABB92A50: client=pluto2-mail.kagi.com[67.134.14.166]
Feb 5 18:41:14 www postfix/smtpd[34067]: warning: networkbiopairinterop: error reading 5 bytes from the network: Connection reset by peer
Feb 5 18:41:14 www postfix/smtpd[34067]: timeout after DATA (986 bytes) from pluto2-mail.kagi.com[67.134.14.166]
Feb 5 18:41:14 www postfix/smtpd[34067]: disconnect from pluto2-mail.kagi.com[67.134.14.166]
Thanks,
Ilja

Hi again,
I was able to further narrow down the problem. The remote server is sending a complete message but postfix on our mac doesn't recognize the end of message token, thus timing out the connection after 5 minutes.
Any ideas? Is this a postfix issue? If so, what can we do about it.
<pre>
0x02e0: 2039 3437 3039 2d31 3430 3520 2055 5341 .94709-1405..USA
0x02f0: 0d0a 5351 4e4d 2d6b 6167 6920 3531 3530 ..SQNM-kagi.5150
0x0300: 0d0a 0d0a 0d0a 0d0a 0d0a 5343 2d54 4659 ..........SC-TFY
0x0310: 5020 352e 3068 0d0a 2e0d 0a P.5.0h.....
19:43:28.538241 IP (tos 0x0, ttl 64, id 8917, offset 0, flags [DF], proto TCP (6), length 64, bad cksum 0 (->9605)!)
www.mydomain.com.smtp > terra.kagi.com.45495: Flags [.], cksum 0x8210 (incorrect -> 0x4852), seq 291, ack 1186, win 33304, options [nop,nop,TS val 928896121 ecr 2567915589,nop,nop,sack 1 {4082:4825}], length 0
0x0000: 4500 0040 22d5 4000 4006 0000 6d46 c4f2 E..@".@[email protected]..
0x0010: 4386 0c1f 0019 b1b7 685e 0685 d895 c111 C.......h^......
0x0020: b010 8218 8210 0000 0101 080a 375d d479 ............7].y
0x0030: 990f 4845 0101 050a d895 cc61 d895 cf48 ..HE.......a...H
</pre>
<pre>
19:48:28.318858 IP (tos 0x0, ttl 64, id 27393, offset 0, flags [DF], proto TCP (6), length 118, bad cksum 0 (->4da3)!)
www.mydomain.com.smtp > terra.kagi.com.45495: Flags [P.], cksum 0x8246 (incorrect -> 0x0c90), seq 291:345, ack 1186, win 33304, options [nop,nop,TS val 928899117 ecr 2567915589,nop,nop,sack 1 {4082:4825}], length 54
0x0000: 4500 0076 6b01 4000 4006 0000 6d46 c4f2 E..vk.@[email protected]..
0x0010: 4386 0c1f 0019 b1b7 685e 0685 d895 c111 C.......h^......
0x0020: b018 8218 8246 0000 0101 080a 375d e02d .....F......7].-
0x0030: 990f 4845 0101 050a d895 cc61 d895 cf48 ..HE.......a...H
0x0040: 3432 3120 342e 342e 3220 7777 772e 6977 421.4.4.2.www.iw
0x0050: 6173 636f 6469 6e67 2e63 6f6d 2045 7272 ascoding.com.Err
0x0060: 6f72 3a20 7469 6d65 6f75 7420 6578 6365 or:.timeout.exce
0x0070: 6564 6564 0d0a eded..
19:48:28.321859 IP (tos 0x0, ttl 64, id 46435, offset 0, flags [DF], proto TCP (6), length 64, bad cksum 0 (->377)!)
www.mydomain.com.smtp > terra.kagi.com.45495: Flags [F.], cksum 0x8210 (incorrect -> 0x3c67), seq 345, ack 1186, win 33304, options [nop,nop,TS val 928899117 ecr 2567915589,nop,nop,sack 1 {4082:4825}], length 0
0x0000: 4500 0040 b563 4000 4006 0000 6d46 c4f2 [email protected]@[email protected]..
0x0010: 4386 0c1f 0019 b1b7 685e 06bb d895 c111 C.......h^......
0x0020: b011 8218 8210 0000 0101 080a 375d e02d ............7].-
0x0030: 990f 4845 0101 050a d895 cc61 d895 cf48 ..HE.......a...H
</pre>
Regards,
Ilja

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10.5 - 10.6.2: Postfix not accepting e-mails from certain hosts

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