problem with recive mail from gmx

[Dörfler Andreas]

just for the archive,

disable selective acknowledgements

echo 0 > /proc/sys/net/ipv4/tcp_sack 

after some help from external we figured out the problem 
has todo with the selective acknowledgements ( tcp ).
after i disabled em no more gmx errors, only errors from 
dynamic (spam)clients left, but they dont matter.

we think thats a kernel or iptablesbug in the
suse default kernel ( linux-2.6.8-24 )

greetings
andy

ASCII ribbon campaign ( )
 - against HTML email  X
             & vCards / \ 

> -----Original Message-----
> From: mailscanner-bounces at lists.mailscanner.info 
> [mailto:mailscanner-bounces at lists.mailscanner.info] On Behalf 
> Of Dörfler Andreas
> Sent: Wednesday, August 30, 2006 2:17 PM
> To: MailScanner discussion
> Subject: problem with recive mail from gmx
> 
> hi there,
> 
> since nearly 1 month i get the folling errors from GMX senders:
> 
> g 30 07:30:51 srv sendmail-in[21651]: k7U5UpY6021651: 
> collect: premature EOM: Connection reset by mail.gmx.de
> Aug 30 07:30:51 srv sendmail-in[21651]: k7U5UpY6021651: 
> SYSERR(root): collect: I/O error on connection from 
> mail.gmx.de, from=<R E M O V E D 02050807 at gmx.de>
> Aug 30 07:47:38 srv sendmail-in[22449]: k7U5lbxl022449: 
> collect: premature EOM: Connection reset by mail.gmx.de
> Aug 30 07:47:38 srv sendmail-in[22449]: k7U5lbxl022449: 
> SYSERR(root): collect: I/O error on connection from 
> mail.gmx.de, from=<R E M O V E D 02050807 at gmx.de>
> Aug 30 07:58:04 srv sendmail-in[23060]: k7U5w3bk023060: 
> collect: premature EOM: Connection reset by mail.gmx.net
> Aug 30 07:58:04 srv sendmail-in[23060]: k7U5w3bk023060: 
> SYSERR(root): collect: I/O error on connection from 
> mail.gmx.net, from=<R E M O V E D 02050807 at gmx.de>
> 
> i get theses errors not from all gmx senders, only from a 
> few, but this few always the same, so they cant send
> mails to us.
> 
> i got some funny contact with gmx first level support, told me thats
> an dns (reverse dns check) error but fact is: its NOT a dns error.
> first lvl support ....
> 
> at the moment i have no idea what i can do because:
> 
> - its only a gmx problem
> - its only from a few gmx senders, not all
> - when i try to send to gmx accounts everthing fine
> - gmx support cant/wont help me
> 
> any ideas ?
> anyone the same problem ?