Your software
My Mautic version is: 5.2.5
My PHP version is: 8.1
My Database type and version is:
Your problem
Hi everyone,
I’m experiencing a problem with sending emails via the etailors_amazon_ses plugin (AmazonSesBundle) in Mautic.
Sending via the SES API works perfectly with my credentials in Postman, but not through the plugin in Mautic.
What works:
- Sending emails via the SES API using the same AWS IAM credentials and region (
eu-west-1) in Postman → works. - Test emails via the plugin work, but segment and campaign emails never do.
What does not work:
-
Sending segment or campaign emails via the plugin always results in the following error:
-
InvalidSignatureException (client): The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method.
-
The error persists even after updating to the latest plugin version.
-
Server time is synchronized (UTC), credentials and permissions are correct, region matches.
Example log excerpt:
AWS SES Error: Error executing “SendEmail” on “https://email.eu-west-1.amazonaws.com/v2/email/outbound-emails”; AWS HTTP error: Client error: POST https://email.eu-west-1.amazonaws.com/v2/email/outbound-emails resulted in a 403 Forbidden response: {“message”:“The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.”}
Payload (shortened):
{ “FromEmailAddress”: “NAME name@example.com”, “Destination”: { “ToAddresses”: [“Vorname_Testcontact_250515_195649 Nachname_Testcontact_250515_195649 email_Testcontact_250515_195649@example.com”] }, “Content”: { “Raw”: { “Data”: “…” } } }
What I have already checked:
- AWS IAM user has all required permissions (
ses:SendEmail,ses:SendRawEmail,ses:GetAccount). - Secret key does not contain special characters.
- Region is set correctly everywhere (
eu-west-1). - Server time is synchronized (UTC).
- Latest version of the plugin is installed (manually updated from GitHub).
- Sending with Postman works using the same credentials and payload.
- The error also occurs with minimal email content (plain text only, no special characters, no HTML).
- domain and e-mailadress are verified with AWS
Question/Request:
Are there any known incompatibilities with Mautic 5.x or Symfony?
Could this be related to signature generation for multipart emails or specific headers?
Do you have any tips on how I can further debug or work around this issue?
Thank you for your support!