I figured out a strange behavior with my little server, specially that with an 64K channel.
 
A user need to send a domn XLS file to 10 other people in the other factory unit, so
he puts 9 of them in the cc line and one in the to line. My question is: qmail is
sending that message 10 times to the same host. I can see 10 qmail-remote instances,
running together, delivery the same message 10 times. It's a 3MB message x 10 = 30 MB
to pass in a 64K channel. It's simply shutdown any other connections due to traffic.
 
Why my mail server don't sent the message only once, to ten users in the same domains
at one time ?
 
I use qmail-1.03 + vpopmail in a Linux small server.
 
Nilo Menezes

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