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January 06, 2024

Google & Yahoo Email Changes

by John Lukach

Google and Yahoo require SPF, DKIM, and DMARC configurations through DNS to help address the high number of fraudulent emails by February 1, 2024. I built an API that checks if a domain has an active MX with SPF and DMARC configured. The DNS lookups actively occur from AWS, so I would not use this when investigating malicious domains.

https://mx.tundralabs.net/4n6ir.com
{
    "domain": "4n6ir.com",
    "mx": "YES",
    "spf": "YES",
    "dmarc": "YES"
}
tags: SPF - DKIM - DMARC