What is a selector?
What is a selector?
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A 'selector' is mechanism to allow a single domain to have multiple keys. Some domains, like Twitter and eBay, use dkim. Google Apps domains typically use google. Others simply use default as a value.

If you have a message signed with a DKIM key, you can find the selector by looking at what is defined for the s= value in the
DKIM-Signature header. In this example, the selector for the domain agari.com is s1024:

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=agari.com; s=s1024;

h=mime-version:from:date:message-id:subject:to;[...]

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