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Reference.org
Local Mail Transfer Protocol
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<p>The Local Mail Transfer Protocol (LMTP) is an alternative to (Extended) <a href="/facts/Simple_Mail_Transfer_Protocol/TeCRKDpJ">Simple Mail Transfer Protocol</a> for situations where the receiving side does not have a mail queue, such as a <a href="/facts/Message_transfer_agent/9SJG5sbb">message transfer agent</a> acting as a <a href="/facts/Message_delivery_agent/Syntl05o">message delivery agent</a>. LMTP was described in <a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc2033">2033</a> in 1996. </p>