Wombatmail (previously XNND)

Overview

Wombatmail delivers what most newsletter creators overlook until it's too late: visibility into email infrastructure. Built by Al Iverson—a deliverability expert who has run the Spam Resource blog since the late 90s—this toolkit exposes the DNS records, authentication settings, and reputation signals that determine whether your newsletter lands in inboxes or spam folders.

The platform combines diagnostic tools with proprietary data on mail hosting across 10 million domains, providing insights most senders never see.

Key Features

DNS Authentication Suite

• SPF record validation and troubleshooting

• DKIM key lookup and verification

• DMARC policy checking and analysis

• BIMI logo discovery and display testing

Domain & IP Intelligence

• Reverse DNS scanning and hostname resolution

• IP reputation checking across major blocklists

• Abuse contact lookup for reporting issues

• WHOIS data retrieval

• CIDR calculator for IP range management

Market Data & Analytics

• Mail hosting breakdown for the top 10M domains

• Provider market share (Google, Microsoft, GoDaddy, Cloudflare, IONOS)

• BIMI adoption tracking across senders

• Spamtrap network insights showing sender behavior

Newsletter Infrastructure

• Mailing list management

• Newsletter sending capabilities

• Double opt-in enforcement

• Live subscriber and engagement stats

Best For

• Newsletter operators diagnosing deliverability drops

• Email marketers auditing authentication before campaigns

• Developers building email infrastructure

• Consultants running client deliverability audits

• Anyone preparing for the BIMI logo implementation

What Sets It Apart

Unlike surface-level email checkers, Wombatmail provides production-tested tools from someone who runs their own newsletter infrastructure. The Spam Resource newsletter—viewable with live stats—demonstrates the platform working at scale. The proprietary domain data adds competitive intelligence that most tools simply don't offer.

Getting Started

1. Visit Wombatmail.com

2. Use individual DNS tools (SPF, DKIM, DMARC checks) without signup

3. Enter your sending domain to diagnose authentication gaps

4. Explore the domain data section for market intelligence

5. Sign up for the Spam Resource newsletter to see the platform in action