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Update DKIM-how-to.md

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Dennis Baaten
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DKIM-how-to.md
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@@ -26,7 +26,7 @@ A common used technique used by spammers is to trick the receiving party into be
# Tips, tricks and notices for implementation
* Use a DKIM key (RSA) of [at least 1024 bits](https://tools.ietf.org/html/rfc6376#section-3.3.3) to minimize the successrate of offline attacks. Don't go beyond a key size of 2048 bits since this is not mandatory according to the RFC.
* Make sure you to change your DKIM keys regularly. A rotation scheme of 6 months is recommended.
* Parked domains should be explicitly configured to not use e-mail. For DKIM this is done with an empty policy: "v=DKIM1; p=".
* It is generally recommended to explicitly configure parked domains to not use e-mail. For DKIM this is done with an empty policy: "v=DKIM1; p=".
# Implementing DKIM with OpenDKIM for Postfix with SpamAssassin
**Specifics for this setup**