This was due to a stale BGP announcement which our Arbor platform didn't 
withdraw after the mitigation stopped. 
This is fixed now.

Apologies
Jan

Am 18.11.2009 um 10:23 schrieb Schmidlin Stefan:

> Same problem here sending mails to bluewin for weeks now.
> 
> Mails sent from our Server to bluewin get a 
> (conversation with mxbw.bluewin.ch[195.186.19.144] timed out while sending 
> end of data -- message may be sent more than once)
> 
> Server: 212.103.79.230
> FQDN: ns1.scnat.ch
> 
> Any solution on this?
> 
> thanks in advance,
> stef
> 
> 
> 
> 
> 
> 
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