24.9.20 ConnectionCacheSize
SMTP connection cache size V8.1 and later
Without a connection cache, sendmail uses a single autonomous SMTP session to transmit
one email message to another host. It connects to the other host, transmits the message,
and closes the connection. Although this approach is sufficient for most mail, there are
times when sending multiple messages during a single connection is preferable. This is
called caching connections.
When sendmail caches a connection, it connects to the host and transmits the mail message
as usual. But instead of closing the connection, it keeps the connection open so that it can
transmit additional mail messages without the additional overhead of opening and closing
the connection each time. The ConnectionCacheSize option of V8 sendmail specifies that
open connections to other hosts should be maintained, and it specifies the maximum
number of those connections. The forms of the ConnectionCacheSize option are as follows:
O ConnectionCacheSize=num ?†? configuration file (V8.7 and later)
-OConnectionCacheSize=num ?†? command line (V8.7 and later)
define(`confMCI_CACHE_SIZE??,num) ?†? mc configuration (V8.7 and later)
Oknum ?†? configuration file (V8.6 and later)
-oknum ?†? command line (V8.6 and later)
Optional whitespace can precede the num. Th enum is an integer that specifies the maximum
number of simultaneous connections to keep open.
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