Viewing profile — awulf

I built a free DMARC/DKIM/SPF checker: https://dmarcchecker.app/ . No usage limits, no ads—just a small footer link to one of my other projects. Made it for the exact reason you me…

An easy way is to check the length of the p= value in the DKIM record. If it's around 216 characters, it's likely a 1024-bit key. A 2048-bit key usually has about 388 characters.

The DKIM verification failed with the result "dkim=policy (weak key)," as it should according to RFC 8301: "Verifiers MUST NOT consider signatures using RSA keys of less than 1024 …

I guess most of these keys are decades old and no longer in use. They're likely just sitting in the DNS because someone forgot to delete them. Now, no one's sure if they're still n…

I published the article today, though it was written a few months ago (when the DKIM record was still online).

I agree, but to be precise, it was 1,726 out of 476,617 DKIM keys found across those 1M domains, or about 0.36%. Since it's impossible to determine all DKIM records a domain might …

Shameless plug: My DMARC Checker at https://dmarcchecker.app/ displays a warning message if it encounters a DKIM signature header with an 'l=' tag: "The 'l=' tag limits how many by…

You are correct, the mail server is currently configured to only receive emails via IPv4. This setup is not uncommon as most major email providers have IPv4-only MX records (with G…

We've just launched the app this week. While white labeling is a possibility down the road, we're currently focused on refining it and gathering user feedback.

Thanks for the feedback, much appreciated! It looks like you've flattened your SPF record, causing a large number of log messages. I'll see what I can do to better highlight the li…

There was a small bug in our DMARC record parser (it didn't like the semicolon at the end of the record). Sorry for that. Your DMARC record is definitely correct. The issue should …

I'm really happy to read that the app was able to help! Thanks for sharing.

Thank you for the input. I have now added a separate "Templates" menu item.

Basically, yes. In practice, there's a bit more to it. The user code is wrapped into an "async function(input)" (so you can use async/await) and run inside a worker inside a sandbo…

The main reason is ease of use. Of course, you can use JSFiddle to create an HTML page with a textarea field and a button that triggers your code and outputs the result to the cons…