Mail Infrastructure
Email Deliverability Engineering
Diagnose authentication, DNS, server configuration and reputation problems that prevent legitimate email from reaching its destination reliably.
Areas we investigate
- SPF, DKIM and DMARC
- PTR and forward-confirmed reverse DNS
- Exim and hosting mail-server configuration
- HELO/EHLO and hostname alignment
- IP and domain reputation signals
- RBL/blocklist investigation
- Bounces and provider-specific rejection messages
- Compromised-account and outbound-spam indicators
From DNS to the mail queue
Deliverability failures often span several layers. HostGree evaluates the full path—from DNS authentication and reverse DNS to mail-server behavior and reputation—rather than treating every rejection as the same problem.