• KIPS Transactions on Computer and Communication Systems
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• v.4 no.10
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• pp.343-348
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• 2015

Due to the need for multilingual e-mail address, EAI Working Group of the IETF has created a wide range of standards associated with e-mail address internationalization(EAI) since 2006. One of the authors and colleagues designed and implemented the mail server, SMTPUTF8, that supports EAI RFC protocols. SMTPUTF8 mail server is composed of new SMTP and POP3 servers supporting EAI RFC protocols. However, SMTPUTF8 did not include a new IMAP server supporting EAI RFC protocol. Recently many people are using smart phones to read and send e-mail messages in a mobile environment. IMAP server is more useful than POP3 server in a mobile environment. Therefore, in this paper, the authors have designed and implemented IMAP server and client app that complies with the IMAP standard (RFC) published by EAI WG of IETF to support multilingual e-mail address. This IMAP server is added to the SMTPUTF8 mail server so that users can access e-mail messages via IMAP client app in a mobile environment.

• Journal of Korea Multimedia Society
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• v.5 no.3
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• pp.307-315
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• 2002

As growing the population of the Internet, e-mail should provide various types of media, and the size of e-mail including multimedia data becomes larger and larger Furthermore, the multimedia e-mail has been used through various communication terminals including mobile devices. The main objectives of this thesis is designing and Implementing efficient mail server which should provide high performance and scalability in terms of storage capacity and the number of mail users. This thesis proposes a cluster-based mail server architecture which has a load-balance node using. If address forwarding for distributing incoming mail messages into distributed mail server nodes.

• The Transactions of the Korea Information Processing Society
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• v.7 no.2S
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• pp.608-620
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• 2000

A web based E-mail system consists of serves which supply mail accounts and service, and clients which take part of interfacing with users. The web browsers such as Netscape Navigator and Internet Explorer are the popular clients. Users who cannot afford to get an E-mail id in general mail servers are, therefore, able to reach a e-mailing service in the web environment by using client programs in connection with a mail server. Although the quality of service has been upgraded a lot in recent days, it doesn't provide with satisfactory services anymore. In this paper, we intend to design a mail agent system based on the web environment. Through this system we could reach a convenient user interface based on Internet Explorer and could easily access administratory environment on the basis of NT Server 4.0. Using the service engine dominent in mail agent system, it could provide with convenient user interfacing tools like responding the absence of users, mail filtering and refusing messages, etc. And it would ultimately make possible a constant system security, by preventing system failure phenomena caused by extraordinary uses beyond its capability.

• Journal of the Korea Convergence Society
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• v.2 no.2
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• pp.13-19
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• 2011

When the existing mail system is attacked by the third party, its content is exposed fully. To solve this problem, designed is the mail encryption system which can send and receive mail safely by the sessionkey. The mail receiver opens encrypted mail with the session key. In the traditional mail system, the server administrator can view mail content. However, in the proposed protocol, the server can only save mail as encryption/decryption is applied. Also, the ARIA encryption algorithm is used in encryption/decryption for better safety, and fast XOR operations are used to reduce the amount of operations.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04a
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• pp.245-248
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• 2002

요즘 E-mail은 중요한 통신수단 중 하나로 사용되고 있다. 그러나 상당수의 E-mail 문서들이 상업성 광고 E-mail과 같은 불필요한 정보를 포함한 채 우리들의 컴퓨터에 분포되어 있다. 본 논문에서는 이러한 문제를 해결하기 위하여 각각의 E-mail 문서들의 내용을 판단함으로써 불필요한 문서들을 자동적으로 필터링 하는 방법을 제안하고자 한다. 전통적인 필터링 방법들은 단어의 빈도수와 같은 단일 속성만을 다루기 때문에 놀은 정확도를 얻을 수 없다. 따라서 본 논문에서는 각각의 사용자에 의해 이미 수신되어진 E-mail 문서들로부터 Personal Profile을 만들고, 이 Personal Profile를 사용함으로써 새로운 E-mail 문서가 사용자에게 중요한지의 여부를 구별하여 주는 방법에 관하여 제안하고자 한다. 이러한 Profile은 E-mail 문서의 송신자, 테마, 유형과 같은 다중 속성 값으로 구성되어 있다. 실험결과로부터 본 논문에서 제안하는 방법이 전통적인 방법보다 더 나은 정확성을 보이고 있음을 알 수 있다.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.36 no.3
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• pp.133-141
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• 2013

The revitalization of e-business via Internet brings big changes to the postal business, and leads to a tremendous increase of heavy and large sized postal mails with continuing growth of home delivery business. Thus, even though the number of intermediate storages for mail delivery that mailmen use for picking up mails in the middle of mail delivery has been being increased, it has still many problems such as insufficient number and size of the storages as well as avoidance of mail keeping of trust agents. It is necessary that safety of mail keeping, seamless mail delivery, and individual parcel pick-up process reestablishment should be made through an improved counter plan for the problems described previously. This study presents the efficient and right operational plan for the intermediate storage for mail delivery with providing the number and size of intermediate storages per mail delivery sequence according to four different types of post offices.

• The KIPS Transactions:PartC
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• v.12C no.3 s.99
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• pp.361-368
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• 2005

Internet mail has become a common communication method around the world because of tremendous Internet service usage increment. In other respect, Most Internet users' mail addresses are exposed to spammer, and the damage of Junk mail is growing bigger and bigger. These days, Junk mail delivery problem is becoming more serious, because this is used for an attack or propagation scheme of malicious code. It's a most dangerous dominant cause for computer system accident. This paper shows the Junk mail filtering model and implementation which is based on FQDN (Fully Qualified Domain Name) check and evaluates it for proposing advanced scheme against Junk mail.

• Journal of Internet Computing and Services
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• v.5 no.2
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• pp.49-55
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• 2004

This paper studies supplementing the points at issue bye-mail system for displaying real name of the addressee about the e-mail transmission failure that could be occurred by misspelled or mistyped e-mail address using e-mail system. E-mail system for displaying real name of the addressee is the system that increase the transmission probability by displaying searched for real name of the addressee on database. This is the study with intent to minimizes the economy loss of transmission success probability, outflow of data, and the server's over-tasking from the inaccuracy transmission of e-mail system.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.13 no.2
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• pp.13-29
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• 2003

Web-mail system is worthy of note as a next generation e-mail system for its mobility and easiness. But many web-mail system does not have any kind of security mechanism. Even if web-mail system provides security services, its degree of strength is too low. Using these web-mail systems, the e-mail is tabbed, modified or forged by attacker easily. To solve these problems, we design and implement secure web-mail system based on the international e-mail security standard S/MIME in this thesis. This secure web-mail system is composed of server system and client system The server system performs basic mail functions - sending/receiving the mails, storing the mails, and management of user information, etc. And the client system performs cryptographic functions - encryption/decryption of the mails, digital signing and validation, etc. Because client system performs cryptographic functions this secure web-mail system gives its reliability and safety, and provides end-to-end security between mail users. Also, this secure web-mail system increase system efficiency by minimize server load.

• Convergence Security Journal
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• v.20 no.3
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• pp.61-69
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• 2020

Since spear-phishing mail attacks focus on a particular target persistently to collect and take advantage of information, it can incur severe damage to the target as a part of the intelligent and new attacks such as APT attacks and social engineering attacks. The usual spam filtering services can have limits in countering spear-phishing mail attacks because of different targets, goals, and methods. In this paper, we analyze mail security services of several enterprises hosted by midium and small-sized enterprises with relatively security vulnerabilities in order to see whether their services can effectively respond spear-phishing mail attacks. According to the analysis result, we can say that most of mail security hosting services lack in responding spear-phishing mail attacks by providing functions for mainly managing mails including spam mail. The analysis result can be used as basic data to extract the effective and systematic countermeasure.