spf?

[James McDonald]

Roger Oberholtzer wrote:

>Clarification: this tells if you are set up to be authoritative. It does not
>tell if your ISP is honoring this. Point your nslookup at your ISP?s DNS
>and see what is ways about your somain.
>  
>
>>Now, if you connect to your DNS with nslookup:
>>
>>	nslookup - my.dns.com
>>
>>and then type
>>
>>	ls -t linux-sxs.org
>>
>>Do you get a listing? Only the authoritative DNS should provide one. 
>>Otherwise you get an error message.The last parameter is the domain, not a
>>machine.
>>
>>For those who use dig, I do not know the method. Maybe it is the same.
>>    
>>
to find the "Start of Authority" i.e. the server that is the primary for 
your zone.

dig -t SOA linux-sxs.org

Also many authorative DNS servers are configure not to allow a ls 
because it's too easy to scavenge all the hosts in your zone.

On the cable modem side of things if your local SMTP  server is being 
block because it's on a Cable IP Range or because it has a Dynamic IP or 
because it doesn't have a Reverse DNS record (PTR) that points to your 
hostname then the answer is to use your ISP's SMTP server for all 
outbound mail transfer it's a simple matter of adding a SMART_HOST 
entry. ISP's generally allow SMTP connections from any host in their range.

I don't use sendmail but

define(SMART_HOST, `mail-server.yourisp.com')

should do it (check the syntax).