IMAP no working properly

[Sz-ecom]

Bug Description

Hi team,

I'm experiencing an issue with the Email trigger (EMAP) in 8N.

I already have a working workflow that uses the same trigger, so I know the general setup works. However, for one specific Gmail account I've connected, the behavior is different: when new emails arrive, they are marked as read, but the automation does not get triggered or executed.

To clarify:

• IMAP is set up with a Gmail account.
• Emails are received and marked as read.
• The automation never starts.

I have another similar workflow that works fine, so this issue seems to be specific to this one Gmail connection.

Is this a known issue, or could there be something specific about this Gmail account causing the problem?

Thanks in advance for your support!

To Reproduce

• Set up two-factor authentication (2FA) on a Gmail account.
• Create an app password from the Google Account settings (under Security > App passwords).
• Open n8n and go to Credentials.
• Create new IMAP credentials with the following details:
  • User: your Gmail address
  • Password: the app password generated from Google
  • Host: imap.gmail.com
  • Port: 993
  • Enable SSL/TLS
• In a new workflow, add an Email Trigger (IMAP) node.
• Select the IMAP credentials you just created.
• Configure the trigger:
  • Mailbox Name: INBOX
  • Action: Mark as Read
  • Format: Simple
• Add a basic action node to test execution (e.g. Extract the sender email).
• Save and activate the workflow.
• Send an email to the connected Gmail account.

Expected behavior

When an email is received by the connected Gmail account, the Email Trigger (IMAP) node should detect the message and trigger the workflow. The workflow should then execute the connected automation steps as configured.

Actual Result

The email is marked as read in Gmail, but the workflow is not triggered and no automation is executed.

Operating System

Ubuntu 22.04.5

n8n Version

Version 1.100.1

Node.js Version

v18.20.6

Database

SQLite (default)

Execution mode

main (default)

[Joffcom]

Hey @Sz-ecom,

Thank you for reaching out! We’ve received your issue and are looking into it. To help us track this internally, we’ve created a Linear ticket with the reference: "GHC-2841".

We’ll keep you updated as we make progress, but if you have any additional details or context to share, feel free to add them here - it’s always helpful!

Thanks for your patience and for bringing this to our attention.

[Joffcom]

Hey @Sz-ecom

As you are using gmail have you tried using the gmail trigger node instead which is specifically designed for working with gmail?

[Sz-ecom]

Hi,

Thanks for the suggestion! I’m currently facing another issue related to the callback URL. It seems like the port number :5678 is automatically appended to all my URLs, including the OAuth2 callback URL:

https://n8n.nxus.vip:5678/rest/oauth2-credential/callback

However, this URL is not accessible, which prevents me from successfully logging into Gmail and completing the OAuth flow.

Do you have any idea how I can fix the callback URL or prevent the port from being added? Any help would be much appreciated!

Thanks again.

[Joffcom]

Hey @Sz-ecom

That is likely a configuration issue and you don't have WEBHOOK_URL set, make sure this is set and you should be good to go.

With the imap issue do you get any errors in the logs?

[Sz-ecom]

My bad, you're right

I had set WEBHOOK_TUNNEL_URL but completely forgot to set WEBHOOK_URL, and that’s exactly why it was still showing the :5678 in the callback URL.

Concerning the logs, no errors are shown:

root@myserver:/opt/n8n# docker logs -f n8n
User settings loaded from: /home/node/.n8n/config
Initializing n8n process
n8n ready on ::, port 5678

There is a deprecation related to your environment variables. Please take the recommended actions to update your configuration:
 - N8N_RUNNERS_ENABLED -> Running n8n without task runners is deprecated. Task runners will be turned on by default in a future version. Please set `N8N_RUNNERS_ENABLED=true` to enable task runners now and avoid potential issues in the future. Learn more: https://docs.n8n.io/hosting/configuration/task-runners/

[license SDK] Skipping renewal on init because renewal is not due yet or cert is not initialized
Version: 1.100.1
Start Active Workflows:
Activated workflow "Support Mail G-ADS" (ID: mLlUHcANmZw0uRIE)

Editor is now accessible via:
https://n8n.nxus.vip

[Joffcom]

Make sure you unset WEBHOOK_TUNNEL_URL there is no need for that to be set if not using the internal n8n tunnel.

[Sz-ecom]

Okay thank you for letting me know, i removed it.
By the way i tried replacing the IMAP trigger with a Gmail trigger directly and it's working fine.
It seems to be related to the IMAP trigger itself and not the google account

[Joffcom]

Hey @Sz-ecom

That makes sense we have other issues reported with the imap node but it is hard to reproduce them sometimes.