Tony Finch wrote:
Murray S. Kucherawy <msk(_at_)cloudmark(_dot_)com> wrote:
One of the more ubiquitous MTAs out there has a feature called
"connection caching" where it will keep some fixed number of outbound
SMTP connections around, cycled using an LRU method, in case a new
message arrives that is routed to a recent destination to avoid the cost
of making a new connection and doing the initial SMTP negotiation.
I believe Postfix and Exchange can do this.
This is also basically known as worker pools. Generally used for
scalability, as of recent years also used to help address socket/ports