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  2. Private Express Statutes - Wikipedia

    en.wikipedia.org/wiki/Private_Express_Statutes

    The PES consists of 18 U.S.C. §§ 1693 – 1696 and 39 U.S.C. §§ 601 – 606, implemented under 39 Code of Federal Regulations Parts 310 and 320. These restrict the carriage and delivery of letter mail by private organizations, except as described in the next section. The PES only cover "letters" and not other mailable items such as parcels ...

  3. Sender Rewriting Scheme - Wikipedia

    en.wikipedia.org/wiki/Sender_Rewriting_Scheme

    Sender Rewriting Scheme. The Sender Rewriting Scheme (SRS) is a scheme for bypassing the Sender Policy Framework 's (SPF) methods of preventing forged sender addresses. Forging a sender address is also known as email spoofing .

  4. Simple Mail Transfer Protocol - Wikipedia

    en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol

    The Simple Mail Transfer Protocol ( SMTP) is an Internet standard communication protocol for electronic mail transmission. Mail servers and other message transfer agents use SMTP to send and receive mail messages. User-level email clients typically use SMTP only for sending messages to a mail server for relaying, and typically submit outgoing ...

  5. Non-tariff barriers to trade - Wikipedia

    en.wikipedia.org/wiki/Non-tariff_barriers_to_trade

    e. Non-tariff barriers to trade ( NTBs; also called non-tariff measures, NTMs) are trade barriers that restrict imports or exports of goods or services through mechanisms other than the simple imposition of tariffs. Such barriers are subject to controversy and debate, as they may comply with international rules on trade yet serve protectionist ...

  6. Messaging pattern - Wikipedia

    en.wikipedia.org/wiki/Messaging_pattern

    Messaging pattern. In software architecture, a messaging pattern is an architectural pattern which describes how two different parts of an application, or different systems connect and communicate with each other. There are many aspects to the concept of messaging which can be divided in the following categories: hardware device messaging ...

  7. List of SMTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SMTP_server_return...

    X.2.XXX Mailbox Status. X.3.XXX Mail System Status. X.4.XXX Network and Routing Status. X.5.XXX Mail Delivery Protocol Status. X.6.XXX Message Content or Media Status. X.7.XXX Security or Policy Status. The meaning of the "detail" field depends on the class and the subject, and are listed in RFC 3463 and RFC 5248 .

  8. Fault-tolerant messaging - Wikipedia

    en.wikipedia.org/wiki/Fault-tolerant_messaging

    Fault-tolerant messaging. Fault Tolerant Messaging in the context of computer systems and networks, refers to a design approach and set of techniques aimed at ensuring reliable and continuous communication between components or nodes even in the presence of errors or failures. This concept is especially critical in distributed systems, where ...

  9. Trade barrier - Wikipedia

    en.wikipedia.org/wiki/Trade_barrier

    Trade barriers are government-induced restrictions on international trade. [1] According to the theory of comparative advantage, trade barriers are detrimental to the world economy and decrease overall economic efficiency . Most trade barriers work on the same principle: the imposition of some sort of cost (money, time, bureaucracy, quota) on ...

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