Simple Mail Transfer Protocol

Klensin, John

doi:10.17487/rfc5321

Cited by 205 publications

(227 citation statements)

References 32 publications

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“…For this period of over sixty days 6 , at the test server, it was recorded:  6,793 distinct source IP addresses  14,282 distinct mail addresses (both sender and receiver)  23,194 connections, of which:…”

Section: Resultsmentioning

confidence: 99%

“…It is roughly divided into three main areas and five components, as shown in Table 2. A decision process is initiated by the MTA, and its goal is to process each SMTP [6] command and decide to either accept or reject the SMTP session or transaction based on available information. When the information is insufficient to make a reliable decision, the MTA returns a temporary fail, and that fact gets registered.…”

Section: Working Principlementioning

confidence: 99%

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A Scalable Spam Filtering Architecture

Ferreira

Carvalho

Pereira

2013

IFIP Advances in Information and Communication Technology

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Abstract. The proposed spam filtering architecture for MTA 1 servers is a component based architecture that allows distributed processing and centralized knowledge. This architecture allows heterogeneous systems to coexist and benefit from a centralized knowledge source and filtering rules. MTA servers in the infrastructure contribute to a common knowledge, allowing for a more rational resource usage. The architecture is fully scalable, ranging from all-inone system with minimal components instances, to multiple components instances distributed across multiple systems. Filtering rules can be implemented as independent modules that can be added, removed or modified without impact on MTA servers operation. A proof-of-concept solution was developed. Most of spam is filtered due to a grey-listing effect from the architecture itself. Using simple filters as Domain Name System black and white lists, and Sender Policy Framework validation, it is possible to guarantee a spam filtering effective, efficient and virtually without false positives.

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Section: Resultsmentioning

confidence: 99%

Section: Working Principlementioning

confidence: 99%

A Scalable Spam Filtering Architecture

Ferreira

Carvalho

Pereira

2013

IFIP Advances in Information and Communication Technology

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“…From S's view, the whole session starts and ends, by interactions with C, in this one case, if the session indeed proceeds this way at run-time: while S remains unconnected, we can consider it as "inactive" with regards to session safety and progress. At the same time, this solution reduces the gap between MPST-based descriptions and real protocols, like Internet application RFCs, by recognising that the client/server connection actions are as important to a rigorous specification as the message passing (e.g., the STARTTLS "re-connection" in SMTP [28], and FTP's active/passive modes [39]). …”

Section: Use Case: Travel Agency Web Service (Revisited)mentioning

confidence: 99%

Explicit Connection Actions in Multiparty Session Types

Yoshida

2017

Fundamental Approaches to Software Engineering

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Abstract. This work extends asynchronous multiparty session types (MPST) with explicit connection actions to support protocols with optional and dynamic participants. The actions by which endpoints are connected and disconnected are a key element of real-world protocols that is not treated in existing MPST works. In addition, the use cases motivating explicit connections often require a more relaxed form of multiparty choice: these extensions do not satisfy the conservative restrictions used to ensure safety in standard syntactic MPST. Instead, we develop a modelling-based approach to validate MPST safety and progress for these enriched protocols. We present a toolchain implementation, for distributed programming based on our extended MPST in Java, and a core formalism, demonstrating the soundness of our approach. We discuss key implementation issues related to the proposed extensions: a practical treatment of choice subtyping for MPST progress, and multiparty correlation of dynamic binary connections.

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“…The term "notification message" ([RFC5321], Section 4.5.5) is used to refer to a message with a null RFC5321.MailFrom.…”

Section: Document Conventionsmentioning

confidence: 99%