Block incoming mail (spam) overnight?

G5 Mac OS X (10.4.6)
I've noticed that 95% of my spam is delivered to me between 12 am and 8 am. Since friends and collegues rarely send me email during those hours, I was wondering if there is a way to disable Mail during those hours and thereby block the emails from ever making it to my inbox.
I've looked through rules and tried unchecking the "enable this account" box in Preferences but have not found anything that works. Any ideas?
Best,
Lea

Securegroup,
jloehler is absolutely correct, when I configure appliances (personally I use a 1 listener config) I set the Default Mailflow Policy to Use the Exception Table ("On") and insure that all incoming mail policies (anything with the ACCEPT action) is set to "Use Default" for this parameter. Then I double check to insure that the RELAY policy is set to "Off" because you don't want to reject outbound messages due to the Exception Table.
Once I've verified that the RELAY is off and Inbound policies are "On" I then populate my exception table with all the internal domains and specify the reject action. Now a quick take away is that the Exception Table only performs the rejection based on the SMTP MAIL FROM not the "From:" header internal to the message itself.
Now with all that said it never fails that there is some internal group that uses 3rd party marketing which spoofs the internal domains so I usually create a new incoming mail flow policy with the Exception Table turned "Off" and create a Sender Group call DOMAINSPOOFLIST which are IPs and Domain names that I allow to spoof internal e-mail addresses with the new mail policy assigned to it.
And that's it.
Sincerely,
Jay Bivens
IronPort Systems

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Securegroup,
jloehler is absolutely correct, when I configure appliances (personally I use a 1 listener config) I set the Default Mailflow Policy to Use the Exception Table ("On") and insure that all incoming mail policies (anything with the ACCEPT action) is set to "Use Default" for this parameter. Then I double check to insure that the RELAY policy is set to "Off" because you don't want to reject outbound messages due to the Exception Table.
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