# Mautic does not sign DKIM

**URL:** <https://forum.mautic.org/t/mautic-does-not-sign-dkim/36356>\
**Category:** Mautic 5 Install/Upgrade Support\
**Created:** [August 18, 2025, 7:14pm UTC](https://forum.mautic.org/t/mautic-does-not-sign-dkim/36356 "2025-08-18T19:14:50Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![kir1050](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/kir1050/32/13386_2.png) [@kir1050](https://forum.mautic.org/u/kir1050)\
**Post date:** [August 18, 2025, 7:14pm UTC](https://forum.mautic.org/t/mautic-does-not-sign-dkim/36356/1 "2025-08-18T19:14:50Z")

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**Your software**  
My Mautic version is: 5.2.7  
My PHP version is: 8.2.29  
My Database type and version is: MariaDB 10.11.13-MariaDB-0ubuntu0.24.04.1

**Your problem**  
My problem is: when I send an email from my own SMTP with my hands via Postfix, the email is sent with DKIM, but when I do the same thing, but via Mautic, for some reason the email is sent without a signature.

on the pic left - Mautic, right - hands

 ![telegram-cloud-photo-size-2-5267282505688546331-y](https://us1.discourse-cdn.com/flex020/uploads/mautic/original/2X/5/53d94e34fd4dc12566237165b35fe22b2013c551.jpeg)

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**Author:** ![larsmattia](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/larsmattia/32/13016_2.png) [@larsmattia](https://forum.mautic.org/u/larsmattia)\
**Post date:** [August 22, 2025, 7:55pm UTC](https://forum.mautic.org/t/mautic-does-not-sign-dkim/36356/2 "2025-08-22T19:55:15Z")

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DKIM signing happens on the SMTP server where you submit the mails.

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**Author:** ![ymlpc](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/ymlpc/32/14600_2.png) [@ymlpc](https://forum.mautic.org/u/ymlpc)\
**Post date:** [November 14, 2025, 2:44pm UTC](https://forum.mautic.org/t/mautic-does-not-sign-dkim/36356/3 "2025-11-14T14:44:07Z")

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DKIM Signature has to be performed at the last step before sending, so at the MTA level…

When you are using Postfix, you are also using rSpamd or Opendkim to sign the message. But Mautic is not an MTA, so it does not sign messages, which is absolutely normal.

The best would be to push messages to Postfix, so the MTA will handle everything, queue management, delivery and DKIM signing.