Fix My Email Deliverability

Automated messages from my domain are dropping straight into spam folders on Yahoo, Hotmail, iCloud, Gmail and some Outlook accounts. I’ve already pinpointed the likely culprits—mis-configured SPF, DKIM and DMARC records—but need an expert pair of eyes to sort them out quickly.

Here’s the current landscape
• DNS is hosted on Simply.
• Emails are sent through Resend via Supabase Edge Functions.

What I need from you
• A thorough audit of my existing DNS zone, focusing on SPF, DKIM and DMARC.
• Correct configuration of all three records so they align perfectly with Resend’s guidelines.
• Real-time verification using MXToolbox, Mail-Tester or similar, demonstrating a clean bill of health.
• A brief changelog explaining what was adjusted and why, so I can replicate or update it later.

Acceptance criteria
• Mail-Tester score ≥ 9/10.
• No critical or high warnings on MXToolbox for SPF, DKIM or DMARC.
• Proof that fresh test emails land in the inbox (not spam) for at least Yahoo, Hotmail and iCloud.

This is a focused task that should take an experienced specialist no more than a couple of hours. If you’ve tackled similar deliverability fixes—especially when Resend is involved—drop a quick note with an example or two, and let’s get it done.