An SPF record is a type of Domain Name Service (DNS) record that identifies which mail servers are permitted to send email on behalf of your domain. It is as easy to adding as MX or A records in your DNS zone.
Today, nearly all abusive e-mail messages carry fake sender addresses. Spammers send email from their mail servers but with your ‘domain’ as the sending email. The victims whose addresses are being abused often suffer from the consequences, because their reputation gets diminished and they have to disclaim liability for the abuse or waste their time sorting out misdirected bounce messages.
The purpose of an SPF record is to prevent spammers from sending messages with forged ‘From Addresses’ at your domain. Recipients can refer to the SPF record to determine whether a message purporting to be from your domain comes from an authorized mail server.
Before creating the SPF record for your domain, it is important to find out which server your domain is going to send emails. Perhaps you are planning to send email using Google Apps or from your own VPS. Consider all the mail server options available.
We will implement this with Google Apps for this tutorial. Here are the following instructions:
Login to your DigitalOcean account. Then open Networking and locate the DNS configuration. Open the desired domain configuration. Now, add a TXT type record.
Write @ at the Enter Name and at the Enter Text, add the following:
"v=spf1 include:_spf.google.com ~all"
Let's explore this little more:
At this point, your DNS configuration should look like this:
This mechanism always matches. It usually goes at the end of the SPF record.
If you are using your own VPS to send email and not any other service like Google Apps, then you can create this as:
"v=spf1 mx -all"
This will allow domain's MXes to send mail for the domain while prohibiting all others. Alternatively, you can input:
This command prevents all host from sending mail.
Thats all, You have done it.
To understand it deeply can explore OpenSPF.
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