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Questions tagged [opendkim]

Open source implementation of the DKIM (Domain Keys Identified Mail). The capabilities include signing and verifying DKIM signature of the email.

OpenDKIM is an open source implementation of the (Domain Keys Identified Mail) sender authentication system standardized by the IETF (RFC6376). The project started from a code fork of version 2.8.3 of the open source dkim-milter package,

OpenDKIM capabilities was including signing and verifying DKIM signature of the email. The package consists of a library that implements the DKIM service and a milter-based filter application that can plug in to any milter-aware MTA such as and .

The documentation of command line options can be found in this page.
The documentation of opendkim.conf configuration file can be found in this page.

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DKIM signing for subdomain issue

I am in an environment that sends emails from different sources. We're a Google Workspace environment as well. The flow is as such: A user (test@domain.tld) in Gmail sends an email to an email group (testgroup@listserv.domain.tld) that resides on…
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Mistake with DKIM 9936A801ED08: no signing table match for using wildcard

I have configured DKIM to be used with wildcards in SigningTable (Centos7) But it gives me an error, and I am not able to see it. Feb 15 08:46:56 monitor01 postfix/submission/smtpd[3374]: connect from localhost[127.0.0.1] Feb 15 08:46:56 monitor01…
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OpenDKIM's UNIX socket and permissions for "others"

Postfix installation procedure created a system user postfix and it's primary group postfix while installation procedure for OpenDKIM created a system user opendkim and it's primary group opendkim. To enable Postfix and OpenDKIM to work together…
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OpenDKIM doesn't reject unvalidated incoming emails

Last a few weeks I found that my OpenDKIM stopped rejecting incoming mails with no dkim-signature, bad-signature etc. Signing outgoing is OK, and according to the mail headers verifying provided, as well. That happened after updating the server's OS…
Ahmed
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intermittent DKIM failure

We have several email servers that send out legitmate email via PostFix and use openDKIM. Recently we've had some recievers claim the DKIM record can not be verified so we've tried various tools such as mail-tester.com, isnotspam.com etc and see the…
dan360
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why opendkim says it isn't running when it is

I installed postfix in a docker container, and installed opendkim there as well. Every time I run a service opendkim status, it gives me opendkim is not running. I tried sysctl status opendkim, and got this: sysctl: cannot stat /proc/sys/status: No…
francisaugusto
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How do you diagnose the steps of opendkim

So I've been spending a few hours today upgrading the server I work on to sign emails with DKIM using opendkim and postfix. It actually works! The problem though is when I use a tool, such as the check-auth verifier, the lookup of the public key…
Nate
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What's the right way to enter DKIM string into BIND zone file?

I use Ubuntu 16.04 LTS. I'm been having this annoying issue again with entering DKIM string (that long code) into my BIND's zone file. In the past (for a different domain) I used to bypass that issue by first copying the string from OpenDKIM's…
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DKIM/Postfix/Debian trouble: Postfix cannot connect to opendkim socket

Setup: Debian 10, postfix 3.4.7 and opendkim 2.11 (both installed from Debian's repositories). I followed Debian's instructions at https://wiki.debian.org/opendkim What looks like the culprit is the socket. In /var/log/mail.log, I do get the…
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OpenDKIM fails to start

I'm trying to install OpenDKIM on Ubuntu 18.04.3 LTS It simply does not start. First I was starting it through the systemd service, but running it from the command line produces the same result. I run with strace and it shows it loading a bunch of…
Jay M
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No signing table match for in OpenDKIM configuratio

I have a problem with my opendkim configuration. I have the alias ciao@mrtsolutions.it that forward all to mymail@gmail.com. When I send email to alias ciao@mrtsolutions.it from me@mrtsolutions.it, I correctly receive the mail in mymail@gmail.com,…
Lorenzo Martini
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OpenDKIM - Correct setting for "MTA" option

I have a server which is used purely for outbound email. I would like opendkim to sign every email going through, assuming it has a signing table entry. However, I can't seem to find any documentation for the correct MTA value I need, or any…
USD Matt
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OpenDKIM signing conditions

Is it possible to use conditions for signing outgoing messages with OpenDKIM? It should only sign outgoing messages if the selector exists in DNS.
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Tons of OpenDKIM Issues

I for the life of me cannot get OpenDKIM to work correctly. I can send and receive messages just fine with postfix and roundcube. I have tried tons of things to get this working. At this point, I am not getting any errors, but OpenDKIM is not…
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OpenDKIM starts before MariaDB on Ubuntu 18.04

I installed OpenDKIM on Ubuntu Server 18.04, using it with Modoboa, so the config file contains DSN for KeyTable and SigningTable to connect to MariaDB. I noticed that the service always fails to start on reboot, but afterwards I can start it…
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