Email Marketing
Glossary

A/B testing is a process used to find out which version of an email performs better. Two versions of the same email are sent to different groups of subscribers. Marketers compare results such as open rates, clicks, and conversions to find the more effective version.

A set of strategies, ranging from copy to design and coding, aimed at making emails understandable and usable to as many individuals as possible, regardless of individual ability.

Marketers send an abandoned cart email (an automated email) to those shoppers who added products to their cart on an e-commerce site but leave without completing their shopping. The reason could be that they want to compare prices or more. An abandoned cart email is an alert reminder that aims to encourage shoppers to return and purchase.

The term "above the fold" explains the part of an email that readers see immediately when they open it, without scrolling. This area is highly important because it is typically the first thing that the reader notices in your email and decides whether he/she will stay or quit.

Alternative text is a short description that we add to an email image. If the image does not load or a subscriber uses a screen reader, the alt text explains what the image shows.

Analytics is basically a box of information that marketers collect from email campaigns to check performance. With the analytics, businesses, with the help of marketers, track metrics such as opens, clicks, conversions, and subscriber engagement.

Anchor text is the clickable text that includes a link. It does not show a full URL but uses clear and meaningful words that tell readers what they will find when they click the link.

An API permits many software programs to communicate and share data with one another. APIs in email marketing enable the integration of email platforms with websites, CRM systems, and other business tools.

Approval is the last step to check for email mistakes and analyze whether the content fulfills brand and compliance standards. Basically, it is a process where the sender evaluates and finalizes the email before sending it to subscribers.

An attachment is a file added to an email, such as a PDF, document, or image. It allows recipients to access additional information without visiting another webpage. It is useful for personal emails, but not secure for commercial initiatives. Spammers and malevolent actors frequently utilize it to spread malware via attachments.

Authentication is a set of security methods that are used to verify that an email is coming from a legitimate sender. It helps in eliminating spam, phishing, and fraudulent emails.

Audience segmentation is a way to divide subscribers into smaller groups based on some factors such as interests, location, purchase history, or behavior. With audience segmentation, it becomes easy for marketers to send more relevant and personalized emails.

An autoresponder is an automated reply email that businesses send just after a customer takes any customer-specified action, like signing up for a newsletter or completing a form.

The average open rate is the ratio that tells how many people have opened your email from the total number of people who received the email. It helps in analyzing a subject line's performance and the sender's name and reputation.

Bounce rate is the percentage of those emails that could not be placed into the recipients' inboxes. If your email has a high bounce rate, it can hurt your sender reputation and shorten email deliverability.

A blacklist is also known as a blocklist. It is a database of domains or IP addresses that are identified as sending spam or unwanted emails. If you are on a blocklist, your emails may not reach subscribers' inboxes.

Bulk email is such an email that marketers send to a large group of recipients in just one click without spending a large amount of time and effort. The common examples of bulk email are newsletters, promotional campaigns, and announcements.

A broadcast email is a one-time email sent to a specific group of subscribers. Businesses use broadcast emails to share updates, promotions, events, or important announcements.

Bounce management is the process of tracking and handling undelivered emails. It helps keep email lists clean by removing invalid addresses and improving delivery rates.

BIMI is an email standard that allows a company's verified logo to appear next to its emails in supported inboxes. It helps increase brand recognition and builds trust with recipients.

Email blast is an older term used for sending one email to a large list at once. Today, it is more commonly called a broadcast or email campaign.

A hard bounce means your email cannot be delivered permanently. The main reason why hard bounce happens is when the email address is invalid, does not exist, or the domain is not active.

A soft bounce means the email could not be delivered temporarily. The main reasons for soft bounce include a full inbox, a server issue, or the message being too large.

CTR is a way of analyzing how many people have clicked on the link that you have provided in the email after opening it. With this metric, email marketers understand the quality of email and how engaging its content is.

The CAN-SPAM Act (Controlling the Assault of Non-Solicited Pornography and Marketing) is a U.S. law. It sets rules for sending commercial and marketing emails. According to this, businesses need to provide accurate sender information, including unsubscribe opt-in, and follow email compliance standards to protect recipients from misleading messages.

In an email, a CTA is a button or link that tells readers what their next step is. Example: "Shop Now" or "Sign Up." Every email should have one CTA.

A cold email is sent to someone who has not interacted with your business before. It helps to start a new business connection or lead through email.

This is a metric in email marketing that shows how many people completed a desired action after receiving your email. Example: if someone bought a product or filled a form.

Churn rate is a measure that explains the percentage of subscribers who quit from your email list through unsubscribes, spam complaints, or undelivered emails. A healthy email list typically sees a churn rate of 0.1% to 1% per campaign. A lower churn rate means your audience stays active longer.

Customer Acquisition Cost (CAC) is the average amount that a business spends on marketing and sales to gain one new customer. This is a profitable metric that measures business growth and its financial stability.

Cost Per Click (CPC) is the amount spent each time someone clicks a link in your email or marketing campaign. It helps measure the performance of your email campaign — is it driving traffic, engagement, and cost-effectiveness?

CRM is a system used to manage customer data and interactions. It helps businesses track leads, emails, and communication in one place.

CRO is the process of improving emails or pages to get more conversions. It focuses on better structure, content, and user response.

DKIM gives a digital signature to your emails and verifies that they were sent from an authorised source. It works for improving email security and builds trust with email providers.

DMARC is an email authentication policy that works with SPF and DKIM to prevent email spoofing. It plays a role in protecting your domain and guides email providers on how to handle suspicious emails.

Deliverability in email marketing shows that the email has been properly delivered into the customer's inbox or dropped into the spam folder. An email marketer should have a strong sender reputation and proper email authentication to improve deliverability.

A drip campaign is a sequence of automated emails sent based on timing or subscriber actions. It helps guide leads and customers through a planned communication process.

A dedicated IP is an IP address used exclusively by one sender for email campaigns. It gives businesses more control over their sender reputation and email performance.

Domain reputation is the trust score email providers assign to your sending domain. A strong reputation increases the chances of emails reaching the inbox.

Dynamic content changes automatically based on subscriber data or behaviour. It allows different recipients to see personalised content within the same email.

Data segmentation is the practice of dividing subscribers into smaller groups based on specific criteria. It helps send more targeted and relevant email campaigns.

Delivery rate is a metric that tells the marketer about the total percentage of emails that are successfully delivered to recipients' mail servers. Email marketers use it to evaluate the overall health and quality of their email list.

This is an email marketing metric that measures how actively subscribers respond to or engage with your emails. This is basically analyzed through actions like opens, clicks, replies, and sometimes conversions. For example, if 1,000 people receive an email and 200 interact, the engagement rate is 20%.

An ESP is a platform or tool that helps businesses create, send, and manage their email campaigns for growth. Examples include services that handle list management, automation, and reporting, like TrueSend.

Email cadence refers to how often and when you send emails to your subscribers. A good cadence keeps users engaged without overwhelming their inbox. For example, if a brand sends weekly newsletters every Monday, it is actually following a fixed cadence.

An email preheader is the short preview text that we see next to or below the email subject line in the inbox. It gives a quick idea of what the email is about and encourages opens. For example, "50% off inside" is shown before opening the email.

E-commerce is basically a type of business that runs online, buying and selling products or services through digital stores. The full form of e-commerce is "Electronic Commerce". Amazon and Walmart are prime examples of E-Commerce.

When your email is automatically delivered to a user's account by analyzing user actions or scheduled workflows, it is called email automation. It made the email marketing comfortable as you just need to set it up, and your email will trigger the user's inbox at the right time without manual effort.

In an email campaign, marketers make a collection of subscriber email addresses to target and grow business; that collection is an email list. It is very helpful in bulk email sending. For example, a brand's newsletter subscriber database is an email list.

The final person who receives and interacts with the email is called the end user. For example, a customer receiving a promotional offer email is an end user in email marketing.

A Feedback Loop is a system where email providers (like Gmail, Yahoo) tell senders when users mark an email as spam. This helps you understand which emails are unwanted so you can improve future campaigns and protect your sender reputation. For example, if 50 users click "Report spam" on your newsletter, the FBL sends that data back to your email platform.

The footer is the bottom section of an email. It usually includes important details like your company information, contact details, unsubscribe link, as well as legal text. It helps keep your emails compliant and gives subscribers an easy way to opt out or learn more about you.

Frequency means how often you send emails to your subscribers. It's important to get the balance right. If you send too many emails, people may unsubscribe. If you send too few, they may stop engaging or forget about you. For example, a weekly newsletter means one email is sent every 7 days.

A forwarded email is when a subscriber shares your email with someone else. It is an important engagement signal because it shows that your content is valuable enough to share. For instance, a user forwards your discount email to a friend, increasing reach.

Fallback content is the backup version of an email that shows up when the main HTML content fails to load properly. It makes sure that the message is visible in all email clients. Example: A plain-text version appears if images or layout fail to load.

Filtering is the process that email providers use to decide where your email goes — inbox, promotions, or spam. It is based on content, sender reputation, and user behavior.

Flagging happens when a subscriber marks your email as spam or reports it as suspicious. Email providers take this seriously because it signals that users don't want your emails. If your email campaign faces too many flags, it can hurt your sender reputation and reduce future inbox delivery.

The Gmail Promotions tab is a section in Gmail where marketing and promotional emails are automatically placed. For instance, Newsletters often land in the Promotions tab. It keeps these emails separate from the Primary inbox so users can focus on personal messages first.

It is a data privacy law that controls how businesses collect, store, and use user data. According to this, user consent before sending marketing emails is important.

Greylisting is a spam protection method where an email is temporarily rejected the first time it's sent. Legit emails are usually sent again and delivered, while many spam emails don't retry and get blocked.

When an email could not be delivered due to an invalid or non-existent email address, it is called a hard bounce. This is a permanent delivery failure, like a fake email ID, closed account, or wrong address.

HTML Email is an email with design elements like images, colors, and buttons. It is not plain text like a normal email and is used in email marketing to make emails look more attractive and clickable. A clear example of an HTML email is a promotional email with banners and buttons.

The header is the head (top) part of any email that describes basic information like the sender's name, subject line, and user details. Besides this, it also contains technical data that helps email systems deliver the message correctly.

A heatmap is a graphic report of your email that shows how people interact with your email. It identifies where users click, scroll, or focus the most, and also helps improve design and CTA placement. You will usually see it in colors like red (high activity) and blue (low activity).

Inbox Placement is where your email lands after you send it, such as the inbox, promotions tab, or spam folder. It shows how well your email is delivered to the main inbox instead of being filtered out.

IP Warming is the process in which marketers slowly increase the number of emails sent from a new email server (IP address). It helps build trust with email providers like Gmail, so your emails don't go to spam. For example, you can start with 100 emails per day, then increase over time.

In email marketing, an ISP (Internet Service Provider) is the service that delivers emails to users' inboxes. Examples include Gmail, Yahoo, and Outlook. They also filter emails and decide if a message goes to the inbox, promotions, or spam folder.

Junk Email is unwanted or spam email that users don't ask for. It usually contains ads, promotions, or suspicious messages and is automatically sent to the spam or junk folder.

JSON (JavaScript Object Notation) is a simple format that is used to send and receive data between systems through APIs. It organizes data in key-value pairs so computers can easily read and share information.

It is a system that scans email content for spam-triggering words and filters emails accordingly. For example, words like "free money" may trigger filters.

Knowledge Base Emails include helpful information, guides, or answers to common questions. The aim of this email is to educate subscribers and help them solve problems without needing direct support.

List segmentation is basically a method to divide your email list into smaller groups, analyzing their behavior or interest. It helps in sending the relevant email to the right people to get a better response.

A landing page is a dedicated web page that guides people toward a specific action, such as signing up, purchasing, or downloading. It generally focuses on one aim and shortens distractions for the user to increase conversion.

List hygiene is a process in email marketing of keeping your email or contact lists clean, accurate, and up-to-date. It removes invalid, inactive, or duplicate contacts. This improves deliverability, engagement, and campaign performance. For example, removing bounced email addresses is part of this.

It is an automated email that marketers send to subscribers or customers at specific stages of their relationship with a brand. Some examples of lifecycle emails are welcome, onboarding, purchase follow-up, or re-engagement to nurture engagement and retention.

It is a computer system or software that sends, receives, and stores email messages between users. It manages email traffic with the help of protocols like SMTP for sending and POP/IMAP for receiving.

It is a data point that is used to track, evaluate, and analyze email performance, progress, or success in a specific area. It measures open rate, CTR, and conversions.

Marketing automation is described as when marketers use software to send email campaigns automatically by analyzing user schedules or actions. It helps in improving efficiency, engagement, and campaign effectiveness.

A newsletter email is like a digital publication that includes updates, news, tips, or promotions with subscribers. Marketers send newsletter emails to keep readers informed, up to date, and engaged with their brand. An example of a newsletter is a "weekly company update email."

A nurture campaign is a set of targeted emails or messages used to build relationships with leads or customers over time. It guides them toward a desired action like a purchase, sign-up, or engagement.

Open rate is a metric that indicates how many people have opened your email. Businesses use this metric to know how engaging or effective the subject line and sender information are in the email. Let's understand this with an example: If 20 out of 100 emails are opened, that's a 20% open rate.

When a person allows a business or organization to send emails or is ready to receive emails, it is called opt-in compliance.

When someone chooses to stop receiving emails or messages from a business, it is called opting out. This usually happens when a user clicks an unsubscribe link to remove themselves from the mailing list.

A series of emails sent to new subscribers or customers after sign-up to introduce them to a product, service, or brand and guide them on how to get started.

When you use subscribers' personal information to analyze their behavior, preferences, or data records instead of sending the same email to everyone, it is called personalized email. This way, marketers send more relevant content email that improves engagement and conversions. For example: 'Hi Rahul, your offer is ready.'

Phishing is a cyber attack in email marketing where scammers send fake emails and show users that they are from trusted sources. Then, they steal people's sensitive personal information like passwords, bank details, or OTPs. These scam emails often use urgent messages or fake links to gain unauthorized access to accounts.

Postmaster Tools is a free service (commonly from Gmail) that helps email senders monitor and improve their email deliverability. It shows data like spam rate, domain reputation, and email performance so you can understand how your emails are being received.

Preview text is basically a short snippet of text that one can easily see next to or below the email subject line in the inbox. It gives a quick summary of the email content and helps improve open rates by encouraging users to click.

A queue in email marketing is a system that holds emails before they are sent to recipients. An email service provider sends this, and it is helpful when businesses need to send large volumes of emails or automated campaigns. With this, marketers manage email delivery efficiently.

Quarantine is an email marketing technique that stores dubious or potentially harmful emails in a different location and stops them from reaching your inbox. It defends users against spam, phishing, and malicious information.

Reply rate explains how many recipients have responded to your email out of the total emails delivered. Marketers get to know through this metric how engaging and relevant their email content is to the audience.

The way an email looks when we see it on different devices, email clients, and screen sizes is known as Rendering. It guarantees that each reader sees the layout, content, and graphics correctly on devices.

A responsive email is an email that automatically modifies its layout, images, and text to fit very different screen sizes and devices like mobiles, tablets, and desktops. It gives readers a smooth reading experience.

A statistic called "spam score" calculates the probability that an email would be flagged as spam by email providers. It affects email deliverability and is determined by variables such as content quality, links, sender reputation, and formatting.

SMTP is a widely used protocol in email marketing. It helps in sending emails through the internet from one server to another. Besides this, it controls the delivery of emails from email clients to the recipient's mail server.

Email providers give a sender a score based on their email sending habits, spam complaints, bounce rates, and engagement. This is known as sender reputation. It defines the possibility that your emails will end up in the spam folder or the inbox.

The subject line is the short text that shows in a recipient's inbox before opening an email. It is a highly important part of an email as it summarizes the email content and decides whether the recipient will open that email or not. For example: "Your Offer Ends Today" is a subject line of an email.

A transactional email is an automated email that marketers send just after a customer clicks on any specific CTA, like sign up, reset password, or place an order. It does not send promotional emails but adds important personalized information related to the action into the email. For example, "Your order has been shipped." is a transactional email.

A trigger email is a behavior-based email that is automatically sent to the user. All transactional emails are trigger emails, but not all trigger emails are transactional — trigger email is broader than that. It can be marketing-focused, relationship-building, or sales-driven. Trigger email examples are a welcome email after sign-up, an abandoned cart reminder, and a re-engagement email if the user is inactive.

A tiny, invisible picture included in an email is called a tracking pixel. Businesses can use it to monitor when emails are opened and how recipients interact with them. It provides information on email performance, such as user involvement and open rates.

When a user does not want to receive email from any company, they click on the unsubscribe option. Then the sender stops sending future emails to recipients. The user uses this option to manage email preferences. Along with that, it is also a standard requirement in email marketing.

User engagement is basically an analytics that helps senders to know the level of interaction and involvement of users with an email, website, app, or any digital content. Companies measure this through actions such as opens, clicks, replies, shares, and conversions. For example, if a subscriber opens an email, clicks a link, and makes a purchase, it indicates high user engagement.

Email verification is a way of checking that an email address is valid, active, and capable of receiving emails. It helps reduce bounce rates, catch fake email IDs, and improve email deliverability. For example, a website sends a verification link to a new user's email address, and the user clicks the link to confirm ownership of the email account.

Email volume refers to the total quantity of emails that are sent or received during a specific period. It helps to measure the scale and activity of an email marketing campaign. Understand by example: If a company sends 50,000 promotional emails in a week, its email volume for that campaign is 50,000 emails.

A whitelist in email marketing refers to a collection of trusted email addresses or domains that are approved by users. Emails from whitelisted senders are more likely to deliver into the inbox rather than the spam folder.

A workflow is a set of automated email actions that are triggered according to a subscriber's behavior or a set condition. It helps send the right emails at the right time without manual effort. Workflows are important because they save time, improve engagement, and help guide customers through the buying process. Example: Welcome → Reminder → Offer emails.

A structured data format called an XML feed is used to automatically update and exchange data between various systems, such as product details, prices, or inventory. Without the need for manual email marketing updates, it maintains correct and current email content.

Yahoo Mail filtering is a system that Yahoo Mail uses to sort incoming emails into the inbox, spam, or other folders based on factors like sender reputation and email content.

Yield rate measures the revenue, sales, or conversions generated from an email campaign. It helps marketers understand how effectively their emails are driving business results. For example: If an email campaign generates ₹50,000 in sales from 1,000 emails sent, that revenue contributes to the campaign's yield rate.

Zero bounce means not a single email failed to deliver. It refers to maintaining a clean email list with valid email addresses to minimize or eliminate bounced emails. It helps improve deliverability and sender reputation.

Zero-party data is information that customers intentionally share with a business, such as preferences, interests, or feedback. It helps create more personalized email campaigns.