If you use Google Apps to handle your email using your own domain name, there may have been times that friends or colleagues you’ve sent email to have failed to receive them.
This is because their anti-spam system may have flagged that email as spam and since people rarely visit their spam folder that email you’ve sent has been deleted without them knowing.
Worse, spammers can forge the ‘From‘ address on mail messages so that spam may look like it came from a legitimate source. And if your PC has been compromised by malware or your email address has been harvested online, there’s a higher chance that you’re domain has been spoofed and used by spammers to trick your friends and contacts that the spam they sent really came from your domain.
Google Apps now supports a feature to prevent such email header spoofing which is the DomainKeys Identified Mail protocol or DKIM. This basically adds a digital “signature” to the header of mail messages you send from your domain.
This digital “signature” can then be verified by recipients to make sure that the mail message really came from your domain.
To add DKIM signature on your outgoing mail using Google Apps, follow these steps:
Log-in to your Google Apps Dashboard
Go to Advanced Tools section
Click on Setup email authentication (DKIM)
Select the domain for which you want to generate a domain key
Click Generate new record
The information needed for the creation of the TXT record in the DNS records of your domain.
It is safer to coordinate with your domain name registrar or web host to accomplish this without any trouble.
Wait up to 48 hours for the DNS changes to fully propagate then you can go back to the Set up email authentication (DKIM) section of your Google Apps Dashboard and click on the ‘Start authentication’ button to activate DKIM authentication to your outgoing mail.
To confirm that the DKIM signing is active, you can send an email to someone and ask them to review the message and check that the ‘signed by‘ line is present and it shows your domain name.
With DKIM signing, your outgoing mail now have a lesser chance of being dumped into the spam folder of your recipient’s email account nor will spammers be able to successfully spoof your domain.