Arturo 'Buanzo' Busleiman writes:

Sam Varshavchik wrote:
What you should do is set up an SPF record in your DNS, and turn on SPF
checking in Courier, so it will simply refuse to receive any mail
supposedly from your domain.

Sam, would you mind providing a "Sam's SPF Example", along with related courier 
settings?

Well, mine is:

courier-mta.com.        86400   IN      TXT     "v=spf1 a:mailx.courier-mta.com 
-all"

My SPF setting is the typical average:

opt BOFHSPFHELO=pass,unknown,error,none,neutral
opt BOFHSPFMAILFROM=pass,unknown,error,none,neutral
opt BOFHSPFTRUSTME=1

The key setting is BOFHSPFTRUSTME=1; so as long as you send your mail with authenticated SMTP, you do not have to worry about getting your own outgoing mail smarthsoted through the server.

I currently use this:

"v=spf1 ip4:216.139.221.215 ip4:216.239.56.0/23 ip4:64.233.160.0/19 
ip4:66.249.80.0/20
ip4:72.14.192.0/18 ip4:209.85.128.0/17 ip4:66.102.0.0/20 -all"

But the SPF web-tests available don't provide me with satisfactory enough 
results. That makes me
believe I'm clearly mistaken :)

I don't particularly see anything that's immediately wrong here, although it is unlikely that your mail can originate from all of these IP addresses.

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