SMTP problem "self-signed certificate in certificate chain"

Questions
1

Describe the problem/error/question

When trying to send an invite email from n8n, an error appears saying:

self-signed certificate in certificate chain

Is this because the cert is not trusted? Will adding the cert or its CA to the /opt/custom-certificates folder fix that? Or is there some configuration where I can disable this warning? I am using an internal corporate SMTP server.

What is the error message (if any)?

self-signed certificate in certificate chain

Please share your workflow

N/A

Share the output returned by the last node

Information on your n8n setup

  • n8n version: n8nio/n8n:1.109.2
  • Database (default: SQLite): Postgres
  • n8n EXECUTIONS_PROCESS setting (default: own, main): whatever the default is
  • Running n8n via (Docker, npm, n8n cloud, desktop app): K8s
  • Operating system: whatever your base image uses
2

If you know why you are getting this message and ok with it, ignoring the issue is an options.

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Otherwise, adding the certificate is what I would try too.

3

Adding the CA fixed it.

1 Like
4

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