Steve wrote:
I want to defer/reject all mail between those hours. The timing does not have to be totally accurate - a few minutes either way is no big issue. I am noticing that all connections overnight are UCE attempts. There has not been a legitimate one every in my logs. I appreciate that this is not going to be true for many, but for us it looks like a plausible approach.
If you're going to do that then deferring rather than rejecting is probably the best option. That way, you won't lose any legitimate mail (as it will come through later when the sending system retries after you re-enable acceptance), but you'll still get rid of the majority of spam as most spam sending systems don't retry - they use a one-shot "fire and forget" sending mechanism and simply ignore any errors.
Mark