Email Validation Glossary

A DNS record that maps a domain to an IPv4 address. Email systems use it to locate where messages should be delivered.

A testing method that compares two versions of an email to see which performs better.

The part of an email visible without scrolling. Content here gets the most attention.

Emails reported as spam or harmful by recipients, damaging sender reputation.

A mail server setup that accepts all addresses on a domain, valid or not.

Status indicating sending privileges are paused due to policy or compliance issues.

A temporary restriction while sending activity is evaluated.

Validation that checks each email individually instead of bulk assumptions.

A partner who promotes products or services in exchange for commission.

An alternate email address that forwards messages to a main inbox.

A list of trusted senders allowed to bypass spam filters.

A system that allows applications to communicate programmatically.

A bounce reported after initial email acceptance by the server.

A file included with an email message.

Verification of sender identity using SPF, DKIM, or DMARC.

An email standard that displays verified brand logos in inboxes.

A database of IPs or domains blocked due to spam behavior.

A mass email sent to a large list at once.

An action preventing emails from reaching a recipient.

Status showing emails are being rejected by the receiving server.

A list used by mail servers to deny known spam sources.

An email that could not be delivered.

How bounces are processed and categorised by mail systems.

A notification explaining why delivery failed.

The percentage of emails that failed delivery.

An inbox folder for promotional or non-priority emails.

An instruction prompting the recipient to take action.

A US law regulating commercial email practices.

Canada’s law governing electronic communications.

A DNS record that aliases one domain name to another.

Addresses that receive emails sent to any username on a domain.

An interaction where a recipient clicks a link.

Percentage of recipients who clicked a link.

Clicks divided by opens, measuring engagement quality.

A spam filtering system used by mailbox providers.

Collecting email consent during another signup process.

Email sent to promote products or services.

Percentage of users who report emails as spam.

Spam reports submitted by recipients.

Adherence to email laws and policies.

An email sent to verify a user action.

A subscription method requiring explicit confirmation.

The text, images, and links inside an email.

A completed desired action such as a signup.

Percentage of recipients who converted.

A file format used to store and upload email lists.

Removing duplicate email addresses from a list.

An IP used by a single sender only.

Ability of emails to reach the inbox.

Percentage of emails successfully delivered.

An email address capable of receiving mail.

An email accepted by the recipient’s server.

Delivered emails divided by sent emails.

An attack flooding inboxes with high email volume.

Temporary email addresses used briefly.

The name identifying a website or email system.

System translating domain names into IP addresses.

An authentication protocol protecting domains from spoofing.

An early email authentication method.

A cryptographic method proving message integrity.

Email content that changes based on user data.

Adding email addresses to existing records.

A tool that identifies invalid or risky email addresses.

Software used to read and send emails.

Inbox placement success of sent emails.

A system that classifies incoming emails.

The part before the @ symbol.

A platform used to send and manage email campaigns.

Checking if an email is formatted and reachable.

Confirming an email address actually exists.

User interaction with email content.

An unsegmented email list.

Clear permission given to receive emails.

A legitimate email incorrectly flagged as spam.

Reports from ISPs when users mark emails as spam.

The bottom section of an email.

A signup form designed to increase conversions.

European regulation governing personal data use.

A dashboard for monitoring Gmail delivery performance.

Emails users receive but rarely engage with.

A technique that temporarily rejects unknown senders.

A permanent delivery failure due to invalid address.

Metadata containing routing and authentication info.

An address used to detect spam activity.

Permission inferred from an existing business or customer relationship rather than explicit signup.

A subscriber who has not opened or clicked emails for a long period.

The technical systems and servers used to send and receive emails.

A company that provides internet access and often operates mail servers.

A numerical identifier assigned to a server for sending or receiving email.

A trust score assigned to an IP based on its email sending behavior.

A collection of email addresses used for sending campaigns.

The practice of removing invalid, inactive, or risky emails from a list.

The practice of paying to send emails to another company’s list.

An email header that allows easy unsubscribing directly from the inbox.

An attack that floods inboxes or servers with massive volumes of email.

Software responsible for transferring emails between servers.

A company that provides email inbox services to users.

Dynamic placeholders used to personalise email content.

An email format that allows multiple content types in one message.

A standard that defines how different data types are transmitted via email.

A DNS record that specifies which server receives emails for a domain.

The process of checking MX records for a domain.

An inbox user who receives and opens a wide range of email types.

The act of giving permission to receive emails.

The action of stopping future email communications.

Email engagement data collected from a sample group of users.

User consent to receive email communication.

Fraudulent emails designed to steal sensitive information.

An email protocol used to retrieve messages from a server.

A role or system responsible for managing email delivery.

A page where subscribers manage email frequency and topics.

An email campaign asking subscribers to confirm continued interest.

A campaign designed to win back inactive subscribers.

Old email addresses reused to identify poor list hygiene.

The email address that receives replies from recipients.

A sender trust score based on engagement and complaints.

An address used to receive bounce messages.

A method that maps an IP address back to a domain name.

Addresses linked to roles like info@ or support@ rather than individuals.

A list of approved senders allowed to reach the inbox.

Test email addresses used to monitor inbox placement.

A subset of an email list grouped by shared attributes.

The process of dividing lists into targeted groups.

An authentication method that defines authorised sending servers.

A system that sends, receives, or stores email.

An IP address used by multiple senders.

The protocol used to send emails between servers.

A Microsoft tool for monitoring IP reputation.

Standardised codes explaining email delivery failures.

A spam technique that spreads email volume across many IPs.

A temporary delivery failure such as a full inbox.

Unwanted or unsolicited email messages.

A blocklist used to identify spam sources.

An address used to detect unsolicited email.

A blocklist focusing on spam related URLs.

A widely used spam filtering system.

A service that reports spam sources.

An organisation that tracks spam and threat intelligence.

Forging sender identity to appear legitimate.

An outdated list with inactive or invalid addresses.

A person who has opted in to receive emails.

A rule for removing inactive subscribers after a set period.

A list of addresses excluded from sending.

Inbox categories that separate emails by type.

Limiting email send speed to avoid server overload.

A domain associated with spam or malicious activity.

Automated emails triggered by user actions.

A DNS based blocklist tracking abusive IP ranges.

The percentage of recipients who opened an email at least once.

Commercial emails sent without recipient consent.

The process of opting out from email communications.

A gradual increase in email volume to build sender reputation.

A list of senders explicitly allowed into the inbox.

A public database showing domain ownership information.

A custom email header used for tracking or routing purposes.