Email Marketing Glossary
Clear definitions for 40+ key terms in email marketing, data marketing, and digital advertising
Clear definitions for 40+ key terms in email marketing, data marketing, and digital advertising
This glossary defines the most important terms used in email marketing, data enrichment, lookalike audience modeling, and digital advertising — compiled by the team at Contact Fuel, an AI-powered marketing platform powered by BIGDBM data.
A method of comparing two versions of an email (subject line, content, send time, etc.) to determine which performs better. Also called split testing. Best practice is to test one variable at a time against a statistically significant audience.
Emails triggered by user actions or schedules — such as welcome sequences, abandoned cart reminders, or re-engagement campaigns — rather than sent manually. Automation improves relevance and efficiency at scale.
The percentage of emails that could not be delivered to the recipient's inbox. There are two types: hard bounces (permanent failures — invalid address) and soft bounces (temporary failures — full inbox, server unavailable). Industry average bounce rate is approximately 1.9%. Hard bounces should be removed from your list immediately to protect sender reputation.
One of the largest proprietary B2C and B2B data platforms in the United States, providing identity resolution, demographics, firmographics, and behavioral data. Contact Fuel's data enrichment and lookalike modeling services are powered by BIGDBM's database of 250M+ verified US consumer and business records.
The US federal law (Controlling the Assault of Non-Solicited Pornography And Marketing Act, 2003) that establishes rules for commercial email. Key requirements: honest subject lines, valid physical address, clear opt-out mechanism, and honoring unsubscribe requests within 10 business days.
A California state privacy law giving consumers rights to know what personal data is collected, request deletion, and opt out of the sale of personal information. Applies to businesses meeting certain revenue or data volume thresholds.
The ratio of unique clicks to unique opens. Measures how compelling the email content is to those who actually opened it. Industry average is approximately 10%. Formula: (Unique Clicks ÷ Unique Opens) × 100.
An email sent to a prospect who has no prior relationship with the sender. Cold email requires a legitimate business purpose, proper opt-out mechanisms, and compliance with CAN-SPAM. Different from spam — cold email is targeted, relevant, and permission-compliant.
An email marketing campaign targeting prospects who do not currently have a relationship with the brand — often reaching customers of competitors. Relies on third-party data (such as BIGDBM) to identify and reach qualified new audiences.
The process of adding missing data fields to existing contact records — such as email addresses, phone numbers, mailing addresses, income ranges, or firmographic data. See also: Data Enrichment.
Enhancing an existing contact database by adding verified third-party data points — including demographics, behavioral signals, company information, income, homeownership status, and digital identifiers. Contact Fuel's Data Enhancement service appends records using BIGDBM data.
An AI-powered marketing technique that analyzes a brand's best customers to identify patterns, then finds new prospects in a large database who share those same characteristics. Also called lookalike modeling. Contact Fuel's Data Cloning service uses AI + BIGDBM data to find thousands of look-alike prospects from a customer upload.
The ability of an email to reach the recipient's inbox rather than being filtered to spam or bounced. Deliverability is influenced by sender reputation, authentication (SPF, DKIM, DMARC), list hygiene, and content quality. Contact Fuel maintains an average 98% delivery rate across all sending programs.
An email authentication method that adds a digital signature to outgoing emails. This signature allows receiving mail servers to verify that the email was actually sent by the claimed domain and has not been tampered with in transit. Required for good deliverability.
An email authentication protocol that tells receiving mail servers what to do when an email fails SPF or DKIM checks. DMARC policies can be set to "none" (monitor), "quarantine" (send to spam), or "reject" (block delivery). Required by Gmail and Yahoo for bulk senders as of 2024.
A series of pre-written, automated emails sent to contacts over time based on specific triggers or schedules. Common examples: onboarding sequences, nurture campaigns, re-engagement flows. The goal is to guide prospects through the buyer journey with timely, relevant messaging.
Data collected directly from your own customers and prospects — website visitors, CRM contacts, email subscribers, purchase history. First-party data is the highest-quality data because you own it and have direct consent. Contact Fuel can power campaigns using your first-party data or supplement it with BIGDBM's second- and third-party data.
Business-level data attributes used to segment B2B audiences — including company size, revenue, industry (SIC code), number of employees, geographic location, and years in business. Equivalent to demographics for companies.
A permanent email delivery failure caused by an invalid, non-existent, or blocked email address. Hard bounces should be removed from your list immediately — high hard bounce rates damage sender reputation and can result in blacklisting.
A detailed description of the type of company or individual most likely to buy your product and receive maximum value from it. ICPs are used as the foundation for lookalike audience modeling and targeted prospecting campaigns.
The process of linking multiple data points (email, phone, cookie, mobile device ID) to a single real-world individual across different systems and touchpoints. Used in data enrichment and multi-channel targeting to ensure consistent audience identification.
The percentage of delivered emails that land in the primary inbox (rather than spam/promotions folders). Different from delivery rate — an email can be "delivered" but still land in spam. High inbox placement requires strong sender reputation, authentication, and relevant content.
The ongoing process of cleaning an email list by removing invalid addresses, hard bounces, unsubscribes, and inactive contacts. Regular list hygiene improves deliverability, reduces bounce rates, and ensures you're paying only for engaged contacts.
A data-driven technique where AI analyzes the characteristics of your best customers and identifies new prospects who share similar attributes — demographics, behavior, firmographics. Used in both email and digital advertising. Contact Fuel's Data Cloning service is built on lookalike modeling powered by BIGDBM.
The percentage of delivered emails that were opened by recipients. Industry average is approximately 39% across all industries. Open rate is tracked via a 1×1 invisible pixel embedded in the email. Note: Apple Mail Privacy Protection (MPP, launched 2021) inflates open rates by pre-loading emails — CTOR is a more reliable engagement metric.
Explicit permission given by a contact to receive marketing communications. Single opt-in requires one confirmation step; double opt-in requires the subscriber to confirm via a follow-up email. Double opt-in produces cleaner lists with higher engagement.
The automated buying and placement of digital display ads using AI and real-time bidding (RTB). Instead of manually negotiating ad placements, programmatic systems match ads to audiences across millions of websites in milliseconds based on targeting data. Contact Fuel's display advertising service uses programmatic buying to reach targeted audiences at scale.
A digital advertising technique that shows ads to people who have previously visited your website or interacted with your brand. Uses cookies or pixel tracking to follow visitors across the web, keeping your brand visible until they're ready to convert.
A score (typically 0–100) assigned by ISPs and email providers to a sending domain and IP address based on sending behavior, engagement rates, spam complaint rates, and bounce rates. A strong sender reputation is essential for inbox placement. Low reputation leads to emails being filtered to spam or blocked entirely.
The standard protocol used to send emails between servers. Enterprise sending platforms (like Contact Fuel) support SMTP relay so clients can send via their own domain and IP while benefiting from the platform's infrastructure and deliverability management.
An email authentication protocol that specifies which mail servers are authorized to send email on behalf of a domain. Published as a DNS TXT record. Required alongside DKIM and DMARC for full email authentication and strong deliverability.
A list of email addresses that should never receive emails — including unsubscribes, hard bounces, and known complainers. Sending to suppression list addresses violates CAN-SPAM, damages deliverability, and can result in blacklisting.
Data collected by a company other than the brand using it or the customer it describes — aggregated from multiple sources and sold/licensed for marketing use. Examples include purchase intent data, demographic databases, and B2B firmographic files. BIGDBM is Contact Fuel's primary third-party data source.
Automated emails triggered by a user's specific action — order confirmations, password resets, shipping notifications, receipts. Transactional emails have the highest open rates of any email type and are exempt from some commercial email regulations.
Contact Fuel provides email marketing, data enrichment, lookalike audience modeling, and display advertising for SMBs — all powered by BIGDBM data. Talk to our team →