What is DKIM?

Sean101

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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

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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

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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

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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

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