[clug] spamsum usage in the real world
Alex Satrapa
grail at goldweb.com.au
Wed Nov 15 04:15:02 GMT 2006
On 15 Nov 2006, at 14:34, Nemo wrote:
> ... especially many business users who are more likely
> to have have many short-lifetime email conversations than personal
> users, the delays would be unacceptable.
When done properly, greylisting only affects the initial message from
a host. After that, the originating host is "whitelisted" and the
remainder of the conversation occurs without any artificial delays.
You don't need to greylist if the sender is approved by relevant SPF
records - the policy manager for your mail server should sort that
out ("If approved by SPF, it gets through, otherwise greylist it if
we haven't seen it, otherwise resort to RBL/XBL").
The only point of greylisting is buying time so that other measures
can take effect. Greylisting all new hosts for 15 minutes may be the
difference between receiving spam/viruses/whatever, and dropping it
due to the RBL being updated in the meantime, for example. That's the
theory anyway.
Alex
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