I understand the point you're correcting (of mine) but I would like a clarification on
Qmail's behaviour when a given message is about to be delivered and the foreign host
refuses the connection because it has too many incoming sessions open.

Peter van Dijk wrote:

> Also, the other hosts will get into the connection-backlog and get their
> turn. That's the beauty of qmail using one connection per message - message
> done, connection closed, next in connection queue gets it's turn. A qmail
> box delivering to another qmail box will never chew up all it's incoming
> connections for a long time, they will nicely rotate. A sendmail box *is*
> able to cause that DoS.

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