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Updated DKIM how to (markdown)

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Dennis Baaten 2019-06-06 18:10:34 +02:00
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DKIM-how-to.md
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@ -9,11 +9,13 @@ A common used technique used by spammers is to trick the receiving party into be
# Tips, tricks and notices for implementation # 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. * 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 you to change your DKIM keys regularly. A rotation scheme of 6 months is recommended. * 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=". * Parked domains should be explicitly configured to not use e-mail. For DKIM this is done with an empty policy: "v=DKIM1; p=".
# Outbound e-mail traffic # Outbound e-mail traffic
DNS record DKIM for outbound e-mail traffic can be accomplished by publishing a DKIM policy as a TXT record in a domain name's DNS zone, and by configuring the e-mail server to sign outbound e-mails.
## Creating a DKIM policy
Signing in Postfix Signing in Postfix