How do I combine subject and sender checks in n8n for an O365 email workflow?

Below is some guidance on how to handle your scenario using n8n’s built-in nodes:

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Using the Switch Node

The Switch node has two modes:

1. Rules Mode:
   In this mode, each output is tied to a single condition. It doesn’t allow you to combine two different conditions (such as checking both the subject and the sender in one output) using an AND operator.

2. Expression Mode:
   In this mode you can write a custom JavaScript expression to decide which output the input should go to. With an expression you can combine both checks. For example, you might write an expression like:

   JAVASCRIPTCopied
   if ($json.subject.includes('keyword') && $json.sender.includes('keyword')) {
       return 0; // sends to first output
   }
   return 1; // sends to second output

   In this case, you manually compute a number that corresponds to one of the available outputs.

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Using the If Node

If your use case has just two branches (one for a match and one for a non-match), the If node might be more straightforward. The If node allows you to combine multiple conditions using AND/OR operators directly in the UI:

• You could add a condition for the subject and then add another condition for the sender.
• When combined with an AND operator, both must be true for the branch to be taken.

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Recommendation

• If you need multiple outputs beyond the typical two (i.e., more than just “matched” vs. “not matched”), then using the Switch node in Expression Mode is the way to go.
• If you simply need to determine whether both conditions pass or fail and then take one of two actions, the If node might be easier to configure.

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Example Logging (Bash)

You provided an example log statement for debugging purposes. You can keep using that for any logging step later in your workflow:

BASHCopied
# Example of logging
echo "Email processed"

This should allow you to set up a workflow that checks both the subject and sender for your specific keywords before either categorising or forwarding the email. Choose the mode that best fits the number of conditional outcomes you need.