Definition
Spam testing evaluates how email filters from major ISPs (Gmail, Outlook, Yahoo) are likely to treat your campaign. It checks content for trigger words, HTML code for suspicious patterns, links against known blacklists, authentication setup, and sending reputation.
What a Spam Test Checks
- Content scoring: Detection of spam trigger words, excessive punctuation, ALL CAPS, and misleading subject lines
- Authentication: SPF, DKIM, and DMARC configuration
- Link analysis: Whether linked domains appear on blacklists
- Reputation check: IP and domain sending reputation
- Code quality: HTML-to-text ratio, image-heavy design, hidden content
- Attachment scanning: File types and size
Tools
Services like Mail-Tester, Litmus Spam Testing, GlockApps, and MxToolbox provide automated spam testing. Most deliver ESPs also include basic spam checks in their pre-send workflows.
Related Glossary Terms
A/B Testing
A/B testing in email marketing is the practice of sending two variations of an email to a small sample of your list to determine which version performs better before sending the winner to the remaining subscribers.
Abandoned Cart Email
An abandoned cart email is an automated message sent to customers who added items to their online shopping cart but left without completing the purchase. It is one of the highest-converting email types in ecommerce.
AIDA Model for Email
The AIDA model (Attention, Interest, Desire, Action) is a classic copywriting framework used to structure email campaigns that guide subscribers from awareness to conversion.
AMP for Email
AMP for Email is a Google-developed framework that allows email messages to include interactive elements like forms, carousels, accordions, and live content. It turns static emails into dynamic, interactive experiences directly inside the inbox.
Anchoring Effect in Email Marketing
The anchoring effect is a cognitive bias where the first piece of information presented (the anchor) influences subsequent decisions, used in email to frame pricing and value perception.
Announcement Email
An announcement email is a dedicated campaign that communicates a specific update, milestone, or change to subscribers, from product launches and feature releases to company news and events.