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DKIM Signature Expiration

What you see when your domain has this problem
DKIM-Signature is expired Details area Ignore
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More Information About Dkim Signature Expiration

The DKIM-Signature has expired on the message and will result in a DKIM FAILURE result at all inboxes.

This expiration tag ("x" tag) is found in the DKIM-Signature headers of outbound messages. This tag contains a specified timestamp for the date when this DKIM key should be treated as revoked by mail servers. 

Some senders actively use expiration tags as a way to manage/cycle through new DKIM keys as an additional way lessen the risk of malicious actors from possibly gaining access to a DKIM key to fool message recipients into opening malicious messages.

DMARC is the key to improving Email Deliverability!

Email is the key to your customer communication strategy. But, what is your email reputation?

Setting up and managing your DMARC configuration is the key to getting insight into your email delivery. MxToolbox is the key to understanding DMARC.

MxToolbox Delivery Center gives you:

  • Who is sending phishing email purporting to be from your domain
  • What is the reputation of your domains and delegated IPs
  • Where other senders are and What their reputations are
  • How your SPF, DKIM and DMARC setup is performing
  • What on-going maintenance you need to maintain and improve your email deliverability

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