Cold Email Deliverability Expert Needed

I’m looking for an experienced cold email deliverability expert to troubleshoot an issue with my email campaigns.

I’m currently sending cold emails using n8n automation, but my emails are consistently landing in Spam/Junk, even after adding a 5-minute delay between emails.

I’ve already done some testing:

Sending a simple text email manually → lands in Inbox
Sending the email through my n8n automation → lands in Spam
Creating/drafting the email through n8n and then sending it manually → still lands in Spam

So I need someone who can determine why the email/content is being classified as spam and identify the actual root cause.

I’m specifically looking for expertise in:

Cold email deliverability
Gmail/Google Workspace spam filtering
Sender/domain reputation
SPF, DKIM & DMARC
Email headers and authentication
Email content and formatting
Cold email best practices
Diagnosing spam placement issues

Please bid only if you have real hands-on experience solving cold email deliverability problems.

I’m not looking for generic advice such as “send fewer emails,” “warm up your domain,” or “wait 5 minutes.” I need someone who can analyze the setup, identify the specific problem, and provide a practical solution.