ZeroBounce Email Validation and AI Scoring - n8n Workflow

Marketing Teams needing high email deliverability.
Sales Professionals managing large lead lists.
Data Engineers seeking robust email hygiene solutions.
n8n users looking for advanced flow control (Switch and Merge n8n node usage).

This automation template provides a robust solution for ensuring email list hygiene and improving sender reputation. Utilizing the specialized ZeroBounce n8n node, this n8n workflow first validates emails to weed out invalid or toxic addresses (like spam traps). Crucially, the n8n workflow then applies A.I. Scoring to the valid contacts, providing a confidence level (0-10). The inclusion of detailed credit checks within the n8n workflow ensures efficient use of ZeroBounce resources, preventing unnecessary API calls if credits are low. By implementing this specific n8n templates, organizations can dramatically reduce bounce rates, protect sender scores, and maximize campaign ROI.

1. Initialization: The n8n trigger starts the process. The flow begins with a set of sample emails which would typically be replaced by a production n8n trigger (e.g., a CRM webhook or a schedule trigger).


2. Split and Credit Check (Validation): The initial list is broken into individual items via the Split Out n8n node. A ZeroBounce n8n node checks if there are enough credits for the validation step. A Merge n8n node waits for the credit check result.


3. Validation: The dedicated ZeroBounce n8n node verifies the status of each email address (e.g., valid, invalid, spam trap).


4. Flow Control (Validation): An Is Valid? Switch n8n node filters out invalid or undeliverable emails immediately. Only valid emails proceed.


5. Credit Check (Scoring): The workflow pauses briefly, then a second ZeroBounce n8n node checks the available credits required for A.I. scoring. A subsequent Switch n8n node determines if scoring should proceed or be skipped if credits are insufficient.


6. A.I. Scoring: If credits are available, a ZeroBounce n8n node applies A.I. scoring, generating a score (0-10) reflecting deliverability confidence.


7. Final Merging and Filtering: The scoring result is merged back with the original validation data using a Merge n8n node that joins by email address. A final Switch n8n node, 'Filter by score', categorizes the validated and scored items into 'High Score' (>= 9), 'Medium Score' (>= 3), or 'Low Score' (< 3) branches, completing the n8n workflow.

1. Import: Download the provided n8n workflow JSON file and import it directly into your n8n instance.


2. Credentials Setup: Locate the ZeroBounce n8n node instances (Validate email, Score email, Check credits). You will need to create a ZeroBounce credential using your API key. Generate your API key from your ZeroBounce account dashboard.


3. Replace Trigger: The current n8n trigger is manual and uses sandbox data. Replace the 'When clicking ‘Execute workflow’' trigger and the 'Sandbox emails' Set n8n node with your preferred data source (e.g., Google Sheets, CRM Trigger, Webhook).


4. Test: Execute the n8n workflow manually to ensure all nodes process data correctly and the ZeroBounce API key is functional.

Manual Trigger: The starting n8n trigger for testing the process.
Set (Sandbox emails): Defines the initial input data structure, loading test email addresses based on ZeroBounce sandbox examples.
Split Out: A core n8n node that converts the initial array of emails into separate items, enabling item-by-item processing.
ZeroBounce (Check credits for validation/scoring): Uses the account resource to check the credit balance before processing. The validation check dynamically requests credits equal to the input item count.
Merge (Wait for checks): Flow control n8n node used to wait for the single-execution credit check results to be combined with the main data stream without altering the data items.
ZeroBounce (Validate email): Executes the primary ZeroBounce validation API call to determine the status of the email address.
Switch (Is valid? / Skip scoring?): Flow control n8n nodes that direct the flow based on validation status or available credits. 'Skip scoring?' determines if the ZeroBounce A.I. scoring step can be executed.
ZeroBounce (Score email): Executes the ZeroBounce A.I. Scoring API call, generating a deliverability confidence score (0-10).
Merge (Merge validation and scoring results): Joins the validation results with the scoring results, enriching the final output with both datasets. Merges based on matching email fields.
Switch (Filter by score): The final filtering n8n node that separates the clean list into High, Medium, and Low score outputs for subsequent actions.