SPF question

[Madison Kelly]

Walter Dnes wrote:
> On Wed, Oct 31, 2007 at 11:32:33AM -0400, Madison Kelly wrote
> 
>>   My question is, how do you setup an SPF entry when email users of your 
>> domain are literally all over the world? It's impractical to impossible to 
>> create a list of all the different MTAs my users may use, and given that 
>> many ISPs now block port 110 to any server other than their own SMTP 
>> server(s), asking non-techy users to use non-standard ports when
>> setting up their email program is also not feasible.
> 
>   I think you meant 25, not 110.  Can you set up an authenticating
> server that accepts submissions on port 587?  Any ISP which blocks that
> port deserves to die.  With your clients sending email out via that one
> server (I hope you have redundancy<g>) you should be able to do a simple
> SPF.
> 

   Hey Walter,

   I thought about using an alternative port, but my cursory look into 
that seemed to show that some clients *couch*outlook[express]*cough* can 
screw up when using non-standard ports. Also, it would require 
"advanced" setup and a good number of my users wouldn't feel 
comfortable/wouldn't be willing to make the needed changes.

   I agree that ISPs who block 25 (yeah, my bad) are annoying, but I can 
also understand from a point of view of ISPs who have mostly windows 
using clients. So many of them are spewing spam as part of a zombie net 
that they need to do something. Grah! frustrating. It's sad that 
expecting users to get educated about stuff is considered wrong these days.

   And yes, the server is fully redundant (via an HA-Linux based two 
node cluster w/ DRBD).

Madi
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