SPF Record for your server
You can create any simple record like:
v=spf1 a mx ptr ~all
Significance of every letter:
ameans A-record. This means IP of this domain.
mxrecords indicate server which accepts mail for this domain. If same mail-server generate outgoing email, accept them.
ptrrecords can help you verify all subdomain for your server. Generally ptr record is linked to FQDN which is different than root domain. This part makes sure mails sent from host.example.com are also accepted.
~allhas 2 more variants
?all. ~ (tidal) results in soft-fail. – (minus) result in hard-fail. If you are new to SPF record, don’t use this. ? (question-mark) means neutral which is as bad as not using SPF at all IMHO!
If you need any help to get SPF record right, you can use spfwizard.com
SPF Record and Google Apps
If you are using Google Apps, then you may be using following for SPF record:
v=spf1 include:_spf.google.com ~all
Now, in addition to Google’s server, your own web-server (where you are hosting your site) most likely sending emails on behalf of your domain.
You can add your server’s IP using a shortcut below:
v=spf1 a include:_spf.google.com ~all
If you compare with previous record, it has only an extra “a”, which means IP address(es) to which A-Record for your domain points.
We are using:
v=spf1 a ptr include:_spf.google.com ~all
Testing SPF Record
You can use excellent web-based tool mail-tester.com.