Configure a SPF rule on Ubuntu

Question

Where I can create/insert the SPF rules to allow a external server to authenticate and send e-mails using the domain name of my server running Ubuntu?

I need to insert this rule:

v=spf1 ip4:111.111.111.111/29  ip4:111.111.111.111/24 a mx ~all

Thanks :)

Answer 1

As Devin says, first step is to figure out where the nameservers are for your domain, using the dig command he's given.

If you aren't the owner/admin of the server that's named as authoritative for your domain, you need to contact the person who is the admin.

If you are the admin, then the nameserver program would normally be Bind, and the configuration file for it would normally be:

/etc/named.conf

That file, named.conf will contain a few lines that tell you where the data for your domain goes. Look for something like:

zone "example.com" IN {
  type master;
  file "example.com.zone";
  allow-update { none; };
};

The critical line is file "example.com.zone" That tells you that the data on the domain example.com is in the text file:

 /var/named/example.com.zone

Then, you edit the example.com.zone file and add a line for your SPF record:

example.com.  TXT  "v=spf1 ip4:111.111.111.111/29  ip4:111.111.111.111/24 a mx ~all"

Answer 2

SPF rules go in the dns rcord for the domain, which may ir may not be runnng on the same server. If you didn't set up Bind, ("named") your dns records are probably elsewhere.

dig example.com ns

should show the name servers