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Re: SPF

On Sat, 24 Jul 2004 14:26, Adam Majer <adamm@galacticasoftware.com> wrote:
> Indeed. SRS breaks SPF. SPF seems to be good only for direct mailing
> domains. It essentially breaks all lists.

SPF could be used in conjunction with greylisting.

If there is a valid SPF entry then the greylist time would be short, if there 
is no valid SPF entry (EG mailing list) then make a greylist time of 8 hours.  
8 hours would be annoying for regular user email (some mail servers generate 
warning messages after 4 hours of non-delivery).  8 hours would not be a 
problem for mailing lists, you have a lot of traffic from a small number of 
IP addresses, and mailing list software copes really well with destination 
sites not accepting mail for a while.

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