Sorry again if this is yet another generic SPF question
but I guess it would still be related to my courier config.
I'm seeing these messages being blocked and I'm not sure why,
an example...

 Jan 25 10:33:19 mail courieresmtpd: error,
 relay=::ffff:216.82.241.83,
 from=<[EMAIL PROTECTED]>:
 517 SPF fail [EMAIL PROTECTED]:
 Address does not pass the Sender Policy Framework

 # dig +short txt xxxxx.com.au
 xxxxx.com.au. TXT "v=spf1 +a:mx2.xxxxx.com.au +a:mx1.xxxxx.com.au 
include:spf.messagelabs.com -all"

so they use a messagelabs.com cluster and 216.82.241.83 is
returned from a lookup of the MX for this domain (in the
ADDITIONAL SECTION section) which I presume would be returned
as part of include:spf.messagelabs.com part ?

The IP of these 2 are overlayed over their ns1/ns2 nameservers
so they are wrong, but the include: part should be right ?

 a:mx2.xxxxx.com.au +a:mx1.xxxxx.com.au

# dig mx xxxxx.com.au.
xxxxx.com.au.  MX      10 cluster9.us.messagelabs.com.
xxxxx.com.au.  MX      20 cluster9a.us.messagelabs.com.

;; ADDITIONAL SECTION:
cluster9.us.messagelabs.com. 541 IN     A       216.82.249.51
cluster9.us.messagelabs.com. 541 IN     A       216.82.254.3
cluster9.us.messagelabs.com. 541 IN     A       216.82.254.35
cluster9.us.messagelabs.com. 541 IN     A       216.82.254.51
cluster9.us.messagelabs.com. 541 IN     A       216.82.241.83 <-
cluster9.us.messagelabs.com. 541 IN     A       216.82.249.3
cluster9.us.messagelabs.com. 541 IN     A       216.82.249.19
cluster9.us.messagelabs.com. 541 IN     A       216.82.249.35
cluster9a.us.messagelabs.com. 717 IN    A       216.82.249.35
cluster9a.us.messagelabs.com. 717 IN    A       216.82.249.51
cluster9a.us.messagelabs.com. 717 IN    A       216.82.254.3
cluster9a.us.messagelabs.com. 717 IN    A       216.82.254.35
cluster9a.us.messagelabs.com. 717 IN    A       216.82.254.51
cluster9a.us.messagelabs.com. 717 IN    A       216.82.241.83
cluster9a.us.messagelabs.com. 717 IN    A       216.82.248.44
cluster9a.us.messagelabs.com. 717 IN    A       216.82.248.45
cluster9a.us.messagelabs.com. 717 IN    A       216.82.249.3
cluster9a.us.messagelabs.com. 717 IN    A       216.82.249.19

# grep SPF /etc/courier/bofh
opt BOFHSPFHELO=pass,unknown,error,none,neutral
opt BOFHSPFMAILFROM=pass,unknown,error,none,neutral
opt BOFHSPFTRUSTME=1

--markc



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