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mailx
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<p>mailx is a <a href="/facts/Unix/0pNL2seI">Unix</a> utility program for sending and receiving mail, also known as a <a href="/facts/Mail_User_Agent/pQdW9HtC">Mail User Agent</a> program. Being a <a href="/facts/Console_application/Gkr3u58Y">console application</a> with a command syntax similar to <a href="/facts/Ed_(text_editor)/a3lSk6Ry">ed</a>, it is the <a href="/facts/POSIX/mQkSt234">POSIX</a> standardized variant of the Berkeley <a href="/facts/Mail_(Unix)/PvrTPnnS">Mail</a> utility. </p>