AI Email Classifier & Auto-Delete for Gmail (SPAM/OFFER Cleaner)

This workflow is designed for freelancers, solopreneurs, and business owners who receive a high volume of irrelevant messages in their Gmail inbox — from cold offers to spammy promotions — and want to automatically filter and delete them using AI. Its main purpose is to scan new emails with the help of OpenAI, classify their content, and automatically delete those considered marketing (OFFER) or junk (SPAM). The result is a cleaner inbox without the need to manually sift through low-value messages. The classification logic uses a detailed system prompt with practical examples, so even complex or borderline messages are categorized accurately. Important emails — such as payment confirmations,

Help me set up the n8n workflow "AI Email Classifier & Auto-Delete for Gmail (SPAM/OFFER Cleaner)" (https://n8n.io/workflows/4507). It uses: Gmail, AI Agent, OpenAI Chat Model. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.