[GH-ISSUE #1773] DKIM signature missing from outgoing emails [ was working fine earlier] #1397

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opened 2026-02-27 11:16:53 +03:00 by kerem · 4 comments

kerem commented

2026-02-27 11:16:53 +03:00

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Originally created by @surajprabhuaissel on GitHub (Aug 30, 2019).
Original GitHub issue: https://github.com/modoboa/modoboa/issues/1773

Impacted versions

Modoboa: 1.13.1
installer used: Yes
Webserver: Nginx

Steps to reproduce

Send an email from the webmail or email client, the DKIM signature will be missing.

Current behavior

Starting today, the DKIM signature is missing from all the outbound emails. While in the Domains Tab, the DKIM and all other show green and the DKIM matches with what I have added in the TXT record. I also tried testing with the SPF and DKIM testing websites e.g https://www.appmaildev.com/en/dkim and in those cases also the DKIM signature status is No Signature. “DKIM-Result: none (no signature)”. Till yesterday 8/29 all emails were fine so was the DKIM, not sure what when wrong today. I even restarted the server hoping any blocked processes doing this but no hope.

Expected behavior

The DKIM signature should be present in the outbound email.

Video/Screenshot link (optional)

Installed Modules and versions

List Domains page with DNS status

Originally created by @surajprabhuaissel on GitHub (Aug 30, 2019). Original GitHub issue: https://github.com/modoboa/modoboa/issues/1773 # Impacted versions * Modoboa: 1.13.1 * installer used: Yes * Webserver: Nginx # Steps to reproduce Send an email from the webmail or email client, the DKIM signature will be missing. # Current behavior Starting today, the DKIM signature is missing from all the outbound emails. While in the Domains Tab, the DKIM and all other show green and the DKIM matches with what I have added in the TXT record. I also tried testing with the SPF and DKIM testing websites e.g https://www.appmaildev.com/en/dkim and in those cases also the DKIM signature status is No Signature. “DKIM-Result: none (no signature)”. Till yesterday 8/29 all emails were fine so was the DKIM, not sure what when wrong today. I even restarted the server hoping any blocked processes doing this but no hope. # Expected behavior The DKIM signature should be present in the outbound email. # Video/Screenshot link (optional) Installed Modules and versions ![image](https://user-images.githubusercontent.com/18698211/64028289-fbe60c00-cb5f-11e9-8549-24390ecfd83c.png) List Domains page with DNS status ![image](https://user-images.githubusercontent.com/18698211/64028321-115b3600-cb60-11e9-8aa9-24e34739bb39.png)

kerem closed this issue

2026-02-27 11:16:54 +03:00

kerem commented

2026-02-27 11:16:54 +03:00

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@surajprabhuaissel commented on GitHub (Sep 5, 2019):

On further research found out the DKIM service had stopped on the server. Not sure why or how. After restarting the service the DKIM signatures are again appearing in the emails.

@surajprabhuaissel commented on GitHub (Sep 5, 2019): On further research found out the DKIM service had stopped on the server. Not sure why or how. After restarting the service the DKIM signatures are again appearing in the emails.

kerem commented

2026-02-27 11:16:54 +03:00

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@gregorypilar commented on GitHub (Sep 6, 2019):

Hi!, how you you started it?

@gregorypilar commented on GitHub (Sep 6, 2019): Hi!, how you you started it?

kerem commented

2026-02-27 11:16:54 +03:00

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@surajprabhuaissel commented on GitHub (Sep 9, 2019):

Started it using the below command

sudo service opendkim start

@surajprabhuaissel commented on GitHub (Sep 9, 2019): Started it using the below command `sudo service opendkim start`

kerem commented

2026-02-27 11:16:54 +03:00

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@rodrigoslayertech commented on GitHub (Apr 27, 2021):

Started it using the below command

sudo service opendkim start

I have the same problem but this solution not work for me.

@rodrigoslayertech commented on GitHub (Apr 27, 2021): > Started it using the below command > > `sudo service opendkim start` I have the same problem but this solution not work for me.