Re: do you use SPF TXT RRs? (RFC4408)

[Rich Kulawiec <rsk () gsp org>]

On Mon, Oct 04, 2010 at 12:47:52PM -0400, Greg Whynott wrote:
> how many of you are using SPF records?  Do you have an opinion on their use/non use of?

1. Not using them, and don't have any (observed) problems despite years
of closely monitoring mail logs looking for just such issues.

2. Note that they don't stop spam, don't stop forgery, and don't prevent
backscatter (aka outscatter).  [Similar/related technologies have
similar/related problems, so these points aren't really SPF-specific.]

3. As others have pointed out, you can just easily be DoS'd when using
them as you could be without.

---Rsk