HELO / FCrDNS

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HELO / FCrDNS prep checklist

Answer below. Path and checklist update immediately — nothing uploaded.

Deadline card

1. Reverse DNS (PTR) on sending IPs?

Branded FQDN PTR with matching A/AAAA (FCrDNS) Generic ISP/hosting PTR string Missing / broken PTR

2. HELO/EHLO hostname quality?

Resolves to connecting IP and stays consistent Placeholder, localhost, rotating, or non-resolving

3. Sending on IPv6?

IPv4 only for now Yes — need /64 + rDNS checks

4. Operator role?

Own mail infrastructure ESP / multi-tenant sending platform

Your path

Notes

Ship checklist

Not legal advice. Re-check live official docs the week you ship.