ABL: An original active blacklist based on a modification of the SMTP

This paper presents a novel Active Blacklist (ABL) based on a modification of the Simple Mail Transfer Protocol (SMTP). ABL was implemented in the Mail Transfer Agent (MTA) Postfix of the e-mail server Zimbra and assessed exhaustively in a series of experiments. The modified server Zimbra showed com...

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Bibliographic Details
Main Authors:	Oliveira, Pablo M, Vieira, Mateus B, Ferreira, Isaac C, Leite, João P. R. R, Oliveira, Edvard M, Kuehne, Bruno T, Moreira, Edmilson M, Carpinteiro, Otávio A. S
Format:	Journal Article
Language:	English
Published:	22-08-2022
Subjects:	Computer Science - Cryptography and Security Computer Science - Networking and Internet Architecture
Online Access:	Get full text
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Summary:	This paper presents a novel Active Blacklist (ABL) based on a modification of the Simple Mail Transfer Protocol (SMTP). ABL was implemented in the Mail Transfer Agent (MTA) Postfix of the e-mail server Zimbra and assessed exhaustively in a series of experiments. The modified server Zimbra showed computational performance and costs similar to those of the original server Zimbra when receiving legitimate e-mails. When receiving spam, however, it showed better computing performance and costs than the original Zimbra. Moreover, there was a considerable computational cost on the spammer's server when it sent spam e-mails. ABL was assessed at the Federal University of Itajub\'{a}, Brazil, during a period of sixty-one days. It was responsible for rejecting a percentage of 20.94% of the spam e-mails received by the university during this period. After this period, it was deployed and remained in use, from July-2015 to July-2019, at the university. ABL is part of the new Open Machine-Learning-Based Anti-Spam (Open-MaLBAS). Both ABL and Open-MaLBAS are freely available on GitHub.
DOI:	10.48550/arxiv.2208.10602