DKIM: Difference between revisions

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= DomainKeys Identified Mail =
'''DomainKeys Identified Mail'''


== Links ==


= Links =
[https://dkimvalidator.com/ DKIMvalidator]
*[http://dkimcore.org/tools/keycheck.html dkim check]  
*[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://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]  
*[https://help.ubuntu.com/community/Postfix/dkim-milter Postfix and dkim-milter]  
*[http://dkim.org/ Homepage]
*[https://www.samlogic.net/articles/dkim--cname-or-txt.htm DKIM with CNAME or TXT]
*[http://www.opendkim.org/opendkim-README http://www.opendkim.org/opendkim-README]  
*[http://www.sendmail.com/sm/wp/dkim// About DKIM]  
*[http://www.sendmail.com/sm/wp/dkim// About DKIM]  
*[[DKIM_with_Sendmail|DKIM with Sendmail]]  
*[[DKIM_with_Sendmail|DKIM with Sendmail]]  
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*[http://www.myiptest.com/staticpages/index.php/DomainKeys-DKIM-SPF-Validator-test http://www.myiptest.com/staticpages/index.php/DomainKeys-DKIM-SPF-Validator-test]  
*[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]  
*[https://www.linode.com/docs/email/postfix/configure-spf-and-dkim-in-postfix-on-debian-9/ SPF and DKIM on Debian]  
*[[OpenDKIM]]


 
=HOWTO=
==Check if keys match==
dig myselector._domainkey.example.com txt


= OpenDKIM Howto =
and save the bit from "p=" to '''public.key.b64'''
 
  openssl enc -base64 -d -in public.key.b64 -out public.key
cd /etc/opendkim/keys
  openssl rsa -pubin -inform DER -in public.key -noout -modulus
 
and compare the shown modulus with
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
openssl rsa -in private.key -noout -modulus
 
  opendkim-genkey -s somename -d domain.name
 
Make sure the key ends up in /etc/opendkim/keys and is readable for user opendkim
 
== SigningTable ==
 
#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.


They should be identical


= FAQ =
= FAQ =
 
[[Category:Mail]]
== 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
     
 
== This doesn't seem to be a valid RSA public key: RSA.xs:178: OpenSSL error: bad base64 decode ==
??

Latest revision as of 08:41, 27 August 2024

DomainKeys Identified Mail


Links

DKIMvalidator

HOWTO

Check if keys match

dig myselector._domainkey.example.com txt

and save the bit from "p=" to public.key.b64 

openssl enc -base64 -d -in public.key.b64 -out public.key
openssl rsa -pubin -inform DER -in public.key -noout -modulus

and compare the shown modulus with 

openssl rsa -in private.key -noout -modulus

They should be identical

FAQ

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