[Gllug] Configuring SPF to cope with secondary incoming mail servers

[Jason Clifford]

On Mon, 4 Dec 2006, Karanbir Singh wrote:

> yes, i agree. In theory its nice. But for it to be of some real value, 
> it needs massive traction online. Specially from ISP's and Hosting 
> companies. Unfortunately they dont seem to like it ( cost and/or 
> ownership issues ? ).

Many ISPs publish SPF records. What we tend not to do is to use it in 
isolation when filtering so it's largely invisible.

ISPs however are the ones least able to benefit from SPF as we have to 
host domains for customers where we cannot know where those users are 
sending mail from. It is companies and individials who have more control 
over the use of their domains who gain most benefit.

> not every rule, but a _lot_ of them yes. We make it a point to specially 
> look at all expensive ones ( cpu / network ).

You consider DNS lookups to be expensive? Perhaps that's an indication of 
an underspecified platform.

Jason
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