MailGenius
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MailGenius is a free email tester that examines HTML and plain text emails for common deliverability problems. It scans for missing SPF, DKIM, and DMARC records, detects spam trigger words, identifies broken links, checks image rendering across clients, and grades the overall email against industry standards. Results load in seconds and include specific fix recommendations.
Great for teams without a dedicated deliverability team or those testing one-off campaigns. The free tier is genuinely useful and includes all core features. More casual than enterprise-grade tools but covers the essentials well enough for most small and mid-market senders testing new templates or tweaking existing ones.