Difference between revisions of "DKIM"

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=DomainKeys Identified Mail=


==Links==
= DomainKeys Identified Mail =
*[http://dkimcore.org/tools/keycheck.html dkim check]
*[https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-dkim-with-postfix-on-debian-wheezy DKIM and postfix]
*{https://help.ubuntu.com/community/Postfix/dkim-milter Postfix and dkim-milter]
*[http://dkim.org/ Homepage]
*http://www.opendkim.org/opendkim-README
*[http://www.sendmail.com/sm/wp/dkim// About DKIM]
*[[DKIM with Sendmail]]
*https://wiki.debian.org/OpenDKIM
*http://www.myiptest.com/staticpages/index.php/DomainKeys-DKIM-SPF-Validator-test
*[https://www.linode.com/docs/email/postfix/configure-spf-and-dkim-in-postfix-on-debian-9/ SPF and DKIM on Debian]


== Links ==
*[http://dkimcore.org/tools/keycheck.html dkim check]
*[https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-dkim-with-postfix-on-debian-wheezy DKIM and postfix]
*[https://help.ubuntu.com/community/Postfix/dkim-milter https://help.ubuntu.com/community/Postfix/dkim-milter] Postfix and dkim-milter]
*[http://dkim.org/ Homepage]
*[http://www.opendkim.org/opendkim-README http://www.opendkim.org/opendkim-README]
*[http://www.sendmail.com/sm/wp/dkim// About DKIM]
*[[DKIM_with_Sendmail|DKIM with Sendmail]]
*[https://wiki.debian.org/OpenDKIM https://wiki.debian.org/OpenDKIM]
*[http://www.myiptest.com/staticpages/index.php/DomainKeys-DKIM-SPF-Validator-test http://www.myiptest.com/staticpages/index.php/DomainKeys-DKIM-SPF-Validator-test]
*[https://www.linode.com/docs/email/postfix/configure-spf-and-dkim-in-postfix-on-debian-9/ SPF and DKIM on Debian]
 


= OpenDKIM Howto =
= OpenDKIM Howto =
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In /etc/postfix/main.cf:
In /etc/postfix/main.cf:


 


  milter_protocol = 2
  milter_protocol = 2
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This will try to fetch the key published in DNS, so "record not found" means DNS record not found. No output is good output.
This will try to fetch the key published in DNS, so "record not found" means DNS record not found. No output is good output.


=FAQ=
= FAQ =
==opendkim: no signing table match for==
 
== opendkim: no signing table match for ==
 
In opendkim.conf use:
In opendkim.conf use:
  refile:/etc/opendkim/SigningTable
  refile:/etc/opendkim/SigningTable


==opendkim-testkey key not secure==
== opendkim-testkey key not secure ==
 
Probably means you have no DNSSEC
Probably means you have no DNSSEC


 
== opendkim: /etc/opendkim.conf: /etc/opendkim/keys/default.private: open(): No such file or directory ==


==opendkim: /etc/opendkim.conf: /etc/opendkim/keys/default.private: open(): No such file or directory==
Means it's defined in opendkim.conf, and you're not using KeyTable
Means it's defined in opendkim.conf, and you're not using KeyTable

Revision as of 19:23, 17 March 2021

DomainKeys Identified Mail

Links

 

OpenDKIM Howto

cd /etc/opendkim/keys

The 'selector' you choose here does not have to be the actual selector used in DNS. It is just the name used for storing the .txt and .private files

opendkim-genkey -s somename -d domain.name

Make sure the key ends up in /etc/opendkim/keys and is readable for user opendkim

SigningTable

  1. somename is the first field in Keytable
*@domain.name somename

KeyTable

Here the name of the selector (the part before ._domainkey) is the one you publish in dns

somename domain.name:selectorname:/path/to/somename.private

Postfix

In /etc/postfix/main.cf:

 

milter_protocol = 2
milter_default_action = accept
smtpd_milters = inet:localhost:8891
non_smtpd_milters = inet:localhost:8891

Checking

opendkim-testkey -d domain.name -s selectorname -v -k keys/keyname.private

This will try to fetch the key published in DNS, so "record not found" means DNS record not found. No output is good output.

FAQ

opendkim: no signing table match for

In opendkim.conf use:

refile:/etc/opendkim/SigningTable

opendkim-testkey key not secure

Probably means you have no DNSSEC

 

opendkim: /etc/opendkim.conf: /etc/opendkim/keys/default.private: open(): No such file or directory

Means it's defined in opendkim.conf, and you're not using KeyTable