The sendmail.cf HoldExpensive option (HoldExpensive) tells sendmail not to connect to expensive delivery agents. Instead, mail destined for those agents is queued for later delivery. This F=e delivery agent flag marks a delivery agent as expensive. For example, consider a site connected to the Internet over a dial-on-demand ISDN link that costs lots of money per minute. Such a site might want all the Internet mail to be queued and would arrange for that queue to be processed only once every other hour . Under V8 sendmail , verbose output (watch delivery) cancels the effect of the F=e delivery agent flag (suppresses queueing). [29] Verbose output is set with the -v command-line switch (-v) or the Verbose option (Verbose).
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