Why DKIM matters for you
DKIM (DomainKeys Identified Mail) adds a cryptographic signature to every email you send, so receiving servers can verify the message genuinely came from your domain and wasn’t altered in transit. It’s one of the two pillars — alongside SPF — that DMARC and inbox placement depend on.
Gmail and Yahoo now effectively require DKIM for bulk senders. Without a valid signature your mail is far more likely to land in spam, and you lose the ability to enforce DMARC, leaving your domain open to anyone who wants to impersonate it.
How DKIM quietly breaks
DKIM is published under a provider-specific selector (like google._domainkey or emailit._domainkey), often on a sending subdomain. That’s exactly why generic checkers report “missing” for domains that are signing perfectly well — they look in the wrong place and give you a false alarm.
Real failures are subtler: a key your provider rotated but you never re-published, an empty p= value that silently revokes signing, or DKIM that was simply never switched on when you connected a new sending tool.
Naive checkers look at the wrong selector and report “missing” for domains that are signing perfectly. Detecting your provider is the whole game.
How Zeqo works for you
This checker first detects your sending provider, then looks for the correct selector across your apex and sending subdomains — so you get an accurate answer instead of a false “missing.” If it’s broken, you get the exact step to fix it inside your provider’s settings.
Zeqo Mail monitors your DKIM continuously and alerts you if the key disappears or is revoked — the kind of change that happens during a provider migration and otherwise goes unnoticed until deliverability craters.
For agencies, that means you catch a client’s broken signing before their campaign does — and you have a timestamped record of exactly when it changed.