DKIM: Difference between revisions
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*[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= | |||
= OpenDKIM Howto = | |||
cd /etc/opendkim/keys | 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 | 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 | opendkim-genkey -s somename -d domain.name | ||
Make sure the key ends up in /etc/opendkim/keys and is readable for user opendkim | Make sure the key ends up in /etc/opendkim/keys and is readable for user opendkim | ||
==SigningTable== | == SigningTable == | ||
#somename is the first field in Keytable | |||
#somename is the first field in Keytable | |||
*@domain.name somename | *@domain.name somename | ||
==KeyTable== | == KeyTable == | ||
Here the name of the selector (the part before ._domainkey) is the one you publish in dns | 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 | 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 = | = Checking = | ||
Revision as of 10:40, 29 September 2020
DomainKeys Identified Mail
Links
- dkim check
- DKIM and postfix
- {https://help.ubuntu.com/community/Postfix/dkim-milter Postfix and dkim-milter]
- Homepage
- http://www.opendkim.org/opendkim-README
- About DKIM
- DKIM with Sendmail
- https://wiki.debian.org/OpenDKIM
- http://www.myiptest.com/staticpages/index.php/DomainKeys-DKIM-SPF-Validator-test
- SPF and DKIM on Debian
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
- 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
