Checking your DKIM DNS record

Update — Due to the recently released vulnerability related to the use of weak cryptographic DKIM keys, I wrote an online tool to check and verify DKIM TXT records, and determine their public key length: DKIM Key Checker

What is DKIM?

DomainKeys Identified Mail (DKIM) is a method for email authentication designed to detect sender address forgery (spoofing) in email, which is often used in spam and phishing emails.

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Counting your top WordPress comment spam source IPs and URLs

Photo of a pizza with Spam slices in the shape of the word "SPAM"
Photo Credit: Flickr/Jerry Pank

I launched a new WordPress blog for a client a few months ago and have been watching as comment spammers find the site and do what they do best, leave spam. As the first few spam comments started coming in I would flag them then manually copy/paste the source IPs and URLs to the built-in WordPress “Comment Blacklist“.

Over time I obviously started seeing some duplicates and I noticed bursts of spam from certain IPs or linking to specific spam URLs. I was curious to see what these top IPs and URLs were, as they would seem the best candidates to include in the blacklist.

So, let’s dig around in the database a bit…

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