# InvalidSignatureException when sending via SES API – Works in Postman, fails in Plugin (Mautic 5.2.6, etailors AmazonSesBundle)

**URL:** https://forum.mautic.org/t/invalidsignatureexception-when-sending-via-ses-api-works-in-postman-fails-in-plugin-mautic-5-2-6-etailors-amazonsesbundle/36185
**Category:** Mautic 5 Install/Upgrade Support
**Created:** [July 24, 2025, 5:06pm UTC](https://forum.mautic.org/t/invalidsignatureexception-when-sending-via-ses-api-works-in-postman-fails-in-plugin-mautic-5-2-6-etailors-amazonsesbundle/36185 "2025-07-24T17:06:09Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![mcgumbel](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/mcgumbel/32/14241_2.png) [@mcgumbel](https://forum.mautic.org/u/mcgumbel)
#### Post date: [July 25, 2025, 8:12am UTC](https://forum.mautic.org/t/invalidsignatureexception-when-sending-via-ses-api-works-in-postman-fails-in-plugin-mautic-5-2-6-etailors-amazonsesbundle/36185/2 "2025-07-25T08:12:34Z")

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[Mautic 5.0.3 AWS SNS endpoint is not working. GIve a solution to handle bounce and Complaint emails - #51 by benbon](https://forum.mautic.org/t/mautic-5-0-3-aws-sns-endpoint-is-not-working-give-a-solution-to-handle-bounce-and-complaint-emails/31334/51) - this suggestion did also not work

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