What is DKIM?

Sean101 · Sep 19, 2016

I have got notifications from my friends that my emails are not working correctly, cause by DKIM. What is DKIM and why should I care? I googling DKIM tools on the internet and found some but when checking with these tools, they required domain name and DKIM Selector. I don't know what DKIM Selector is, can you guys help me find out it on my hosting?

VirtuBox · Sep 19, 2016

Hello Sean !
DKIM operates by authenticating the identity of the message signer from the purported author of the message allowing for verification of responsible senders and the integrity of the message contents. This authentication of responsibility for a message is validated via a cryptographic signature and querying the signer's domain to retrieve a public key.

That mean you don't have a correct DNS TXT record with DKIM.
DKIM records look like :

Code:

default._domainkey.yourdomain.com TXT v=DKIM1; p=MIGfMgegDQEBAQUAA4sdht/pwZCEiCtIEDHcAD6LgR/5TQ8tfhnpWACsZN7Ky7liZzcrG53qocaLJjvKb4RtijHxdkjGeYDLd3reuIop705VifRjnGVM+rMX1Lwod6Wtiu/ohP+BqIU8V4D5D4GRUT5VpBf6wX33HGLtXI6agG0RWaVNGlQIDAQAB;

Sean101 · Sep 20, 2016

There is a way to check if DKIM is working on my VPS or not?
I am searching for the information about DKIM Selector which is being required by some tools to check the validation of DKIM.
One question more, if I don't have DKIM what can happen for my websites?

VirtuBox · Sep 20, 2016

The DKIM doesn't impact your websites, but when it's activated in your control panel, all emails sent from your domain are signed with your DKIM.
And when another server receive your email it will check if there is the same DKIM record on your DNS server. If not it could be returned to the sender because there is no proof of the sender identity.

So you have to check if you domain have this record.
For that use this tool : http://mxtoolbox.com/deliverability
You just have to send them an email to get a full report. You will see if the dkim record exist

KevinHV · Sep 22, 2016

Are you using any control panel on VPS ? Most of the control panel have option to enable DKIM record. If needed you can generate dkim key using : http://dkimcore.org/tools/keys.html

To see how to add dkim record visit : https://support.rackspace.com/how-to/create-a-dkim-txt-record/

Sean101 · Sep 22, 2016

Thank you I will have a test on these tools

KevinHV said:
Are you using any control panel on VPS?

Of course I am using a hosting panel, I will try to search the tutorials and check them out.

What is DKIM?

Sean101

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Sean101

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