---
title: "Simple & Easy Notification Service glossary"
slug: "sens-glossary"
updated: 2026-10-08T06:49:22Z
published: 2026-10-08T06:49:22Z
canonical: "guide.ncloud-docs.com/sens-glossary"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://guide.ncloud-docs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Simple & Easy Notification Service glossary

Available in Classic and VPC

Familiarize yourself with these key terms to get the most out of Simple & Easy Notification Service. The terms and their descriptions are as follows:

### Application Programming Interface (API)

Collective term for the various interfaces that allow you to write application programs using an operating system, system, application, library, and so on through programming

### Fail-over

Backup mode in which a secondary system takes over and operates when the primary system stops due to a failure or the end of its operating time

### Simple Mail Transfer Protocol (SMTP)

Standard communication protocol used to send email on the internet

### Domain Name System (DNS)

NAVER Cloud Platform service that helps identify and find domain names on the internet as actually accessible addresses

### Sender Policy Framework Record (SPF Record)

Record that specifies a security policy. It is mainly used to prevent spam by specifying information such as the IP addresses of servers that send email, which prevents email address spoofing, and it sets text information for the domain in a TXT (domain description) record. Mainly used for the same purpose as SPF records

### Bounce

Case in which an email delivery attempt fails and the email is returned

### Cloud Outbound Mailer

NAVER Cloud Platform service that lets you easily send bulk notification, informational, and marketing emails through the UI or by connecting it to your running services

### DKIM (DomainKeys Identified Mail)

Email authentication method that uses a digital signature to verify on the receiving server that a received email has not been forged or altered

              Note

              

For additional terms, see [Glossary](https://www.ncloud.com/guideCenter/glossary) on the NAVER Cloud Platform portal.