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SureM Co., Ltd. (Korean: 슈어엠주식회사; RR: Syueoem Jusikhoesa) is a South Korean business messaging and communications platform as a service (CPaaS) company headquartered in Gwangjin-gu, Seoul. Founded in March 2000 by Lim Nam-ho (임남호), the company provides messaging infrastructure including SMS, MMS, RCS, KakaoTalk business messages, WhatsApp Business messaging, and international SMS to enterprise clients in South Korea and worldwide.

The company's name derives from "Sure Message," reflecting its founding commitment to reliable message delivery. SureM operates direct connections with South Korea's three major telecommunications carriers — SK Telecom (SKT), KT Corporation (KT), and LG U+ — and is an authorized KakaoTalk Business Message official dealer (공식 딜러사). As of 2024, the company serves more than 6,000 enterprise clients and 50,000 individual customers across more than 200 countries, with a reported delivery rate of 97%+.

SureM was established in March 2000 in Seoul, South Korea, initially providing domestic mobile messaging services during the early expansion of mobile internet infrastructure in Korea.

In 2002, the company was designated a high-quality technology company (우량기술기업) by the Korea Technology Finance Corporation (기술신용보증기금) and began building international SMS routing infrastructure.

In 2004, SureM interconnected its international SMS platform with major Korean telecommunications operators including Dacom (국제전화 002) and Hanarotelecom (국제전화 005), and extended international SMS coverage to more than 160 countries. The company was also selected for the government's Globalization of Excellent Venture Companies program (우수벤처기업 글로벌화 추진대상기업) by the Small and Medium Business Administration.

By 2005, SureM had extended international SMS coverage to more than 200 countries and supplied international SMS services to Yahoo!.

In 2006, SureM was designated an Inno-Biz (이노비즈) company — a South Korean government certification recognizing technology-innovative small and medium enterprises — and built the Microsoft Outlook Mobile Service (OMS) platform for the South Korean market.

In 2007, SureM supplied international SMS services for SK Communications' Nate-On platform and received the Minister of Trade and Industry Award (산업자원부장관상) at the 11th Korea e-Business Awards. Also in 2007, the company received the SME Agency Director's Commendation (중소기업청장 표창) at the Venture Company Awards.

In 2009, SureM received the 8th Korea Digital Innovation Award and the Electronics and Telecommunications Research Institute (ETRI) Director's Award.

In 2011, SureM was granted a patent for an "SMS/MMS service system searchable through portal websites." The company also provided KakaoTalk with a global OTP (one-time password) authentication system serving KakaoTalk's user base across 200 countries during the app's early growth phase. Also in 2011, SureM supplied authentication services to Samsung Electronics using mobile phone certification systems.

In 2013, SureM signed an international SMS supply agreement with Daum Communications and a BMW OMS service supply contract. The company was also selected as an Export Promising Company (수출유망기업) by the Small and Medium Business Administration.

In 2014, SureM received the Prime Minister's Commendation (국무총리표창) at the 15th Korea SME Technology Innovation Exhibition in the Technology Innovation Enterprise category. The company was also designated a Hi-Seoul Brand Company (하이서울 브랜드 기업) by the Seoul Metropolitan Government. SureM was recognized as a Seoul Model Taxpayer (서울시 모범납세자) and received the Minister of Science, ICT and Future Planning Award for contributions to preventing telecommunications financial fraud.

In 2016, SureM received the Minister of Trade, Industry and Energy Award at the Korea e-Business Awards.

In 2018, SureM received the Minister of Science and ICT Award (과학기술정보통신부장관상) at the Korea Digital Innovation Awards.

In 2023, SureM received a commendation from the Jamsil Tax Office (잠실세무서장 표창) at the 57th National Taxpayer Day.

In 2024, SureM reported annual revenue of approximately 25.3 billion Korean won (KRW).

SureM provides three standard tiers of Korean domestic text messaging as a licensed messaging relay operator (메시지 중계사업자):

• SMS — Short message service, up to approximately 90 bytes (45 Korean / 90 English characters)
• LMS (Long Message Service) — Extended text message, up to approximately 2,000 bytes
• MMS (Multimedia Messaging Service) — Image and text combined messages

As an authorized KakaoTalk Biz Message official dealer (공식 딜러사), SureM offers:

• AlimTalk (알림톡) — Transactional and informational notifications (order confirmations, delivery alerts, reservation reminders, OTP) delivered via pre-approved templates to KakaoTalk users
• Brand Message (브랜드 메시지) — Rich-format brand communications

SureM provides a hybrid fallback system that automatically re-routes KakaoTalk messages as standard SMS when KakaoTalk delivery fails, aiming to maximize overall delivery rates.

SureM provides RCS business messaging and RCS template messages, enabling brand verification displays, carousel banners, and interactive buttons within a handset's native messaging application without requiring third-party app installation.

SureM's global messaging network supports both outbound (South Korea to international) and inbound (international to South Korea) messaging. Coverage extends to more than 200 countries through direct connections to more than 800 carriers, with the network divided into four regional groupings: Asia-Pacific (50+ countries), Europe (45+ countries), Americas (40+ countries), and MEA/Oceania (65+ countries).

SureM supports the following international messaging channel types:

• SMS (Global) — Standard short message, 160 English characters or 70 Unicode characters; authentication and urgent alerts
• C-SMS (Concatenated SMS) — Automated multi-part messages up to 500 characters; order and reservation notifications
• MMS (International) — Image and text combined; visual marketing and promotions, with noted strength in Greater China markets
• WhatsApp Business — Template messages, two-way conversations, rich media (images, documents, video), CTA buttons, and read receipts across 200+ countries

The company's network uses Unicode/UCS-2 encoding to support multilingual transmission in more than 20 languages including Korean, Chinese, Japanese, and Arabic without character corruption. SureM also provides country-specific sender ID registration guidance and compliance support for regulated markets including Singapore, China, and Vietnam.

SureBIZ (슈어비즈) is SureM's enterprise messaging portal available at surebiz.co.kr. The platform supports web console sending, bulk Excel file upload (up to 1,000,000 records), REST API integration, SMPP v5 connectivity, MM4/MM7 interfaces for MMS, delivery reports, and per-recipient variable substitution.

SureM contributed to the development of the international SMPP standard and operates SMPP v5 connectivity.

• International mobile authentication — Real-time OTP delivery to mobile numbers in 220+ countries; used for foreign-national membership registration and global identity verification
• China two-way messaging — Two-way SMS service for the Chinese market with web-based reply management; supports simplified and traditional Chinese characters (70-character replies)
• Voice OTP — Automated multilingual text-to-speech (TTS) voice calls for authentication where SMS delivery is insufficient for the destination
• Number lookup — Pre-send validation of carrier, handset availability, number portability status, and roaming status

In addition to enterprise services, SureM operates a consumer-facing messaging portal at surem.com for individual users without a business registration, primarily serving use cases such as group notifications, wedding announcements, and community messaging.

SureM's international enterprise client base, as publicly disclosed by the company in its corporate materials, spans finance, retail, luxury/beauty, travel, technology, public sector, logistics, and wholesale messaging sectors. Disclosed international clients include CHANEL, Gucci, LVMH, L'Oréal, Huawei, Alibaba, Temu, Klook, Twilio, Vonage, KDDI, and AMD Telecom.

Domestic enterprise clients referenced by the company include KB Kookmin Card, Shinhan Bank, Hyundai Motor Company, Korean Air, Coupang, FedEx, the Financial Supervisory Service (금융감독원), and Seoul National University Hospital (서울대학교병원).

• Short Message Service
• Communications platform as a service
• KakaoTalk
• Rich Communication Services
• WhatsApp Business
• SK Telecom
• KT Corporation
• LG U+

• Official website (International / English)
• SureM Korea (Korean)
• SureBIZ enterprise platform

Category:Telecommunications companies of South Korea Category:Companies based in Seoul Category:Companies established in 2000 Category:Mobile telecommunications Category:Business software companies