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Sendmail
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<p>Sendmail is a general purpose <a href="/facts/Internetwork/sCyckA2T">internetwork</a> <a href="/facts/Email/6pD9GLtI">email</a> routing facility that supports many kinds of mail-transfer and delivery methods, including the <a href="/facts/Simple_Mail_Transfer_Protocol/TeCRKDpJ">Simple Mail Transfer Protocol</a> (SMTP) used for email transport over the <a href="/facts/Internet/Xw1rVvJU">Internet</a>. </p><p>A descendant of the <i><a href="/facts/Delivermail/UBqoghBz">delivermail</a></i> program written by <a href="/facts/Eric_Allman/ptcFgRQM">Eric Allman</a>, Sendmail is a well-known <a href="/facts/Project/7pXnTsmF">project</a> of the <a href="/facts/Free_and_open_source_software/1cHtjLCB">free and open source software</a> and <a href="/facts/Unix/0pNL2seI">Unix</a> communities. It has spread both as <a href="/facts/Free_software/IaoVtJXn">free software</a> and <a href="/facts/Proprietary_software/9zcskxYL">proprietary software</a>. </p>