Luigi Iotti:
> > I wonder if the machine is running something that slows down traffic
> > that looks "suspicious" to a data rate of 1 byte/s.
> 
> But the same behaviour is exhibited by two machines, connected to the
> Internet by completely different carriers with different service agreements.

In the first post you mentioned that both machines are operated by
you. 

Begin speculation:

    You configured both systems in a similar way.

End speculation.

One of my experiences with Postfix is that people cut-and-paste
configurations from elsewhere, and that they do not always fully
understand the consequences. 

I would not be surprised if there was some network rate limiting
feature that you inadvertantly turned on, and that limits the data
rate to 1 byte/second under some conditions.

        Wietse

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