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/usr/share/mc/syntax/mail.syntax is in mc-data 3:4.8.11-1.

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The actual contents of the file can be viewed below.

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wholechars abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_01234567890.-

context default
    spellcheck

context linestart From\s \n\n cyan
    keyword linestart From: brightgreen
    keyword linestart From\s brightred
    keyword <*@*> white
    keyword whole +@+ white
    keyword linestart To: brightmagenta
    keyword linestart Subject: brightred/Orange
    keyword linestart +: brown

context linestart Return-path:\s \n\n cyan
    keyword linestart From: brightgreen
    keyword linestart From\s brightred
    keyword <*@*> white
    keyword whole +@+ white
    keyword linestart To: brightmagenta
    keyword linestart Subject: brightred/Orange
    keyword linestart +: brown

context linestart Return-Path:\s \n\n cyan
    keyword linestart From: brightgreen
    keyword linestart From\s brightred
    keyword <*@*> white
    keyword whole +@+ white
    keyword linestart To: brightmagenta
    keyword linestart Subject: brightred/Orange
    keyword linestart +: brown

context linestart From:\s \n\n cyan
    keyword linestart From: brightgreen
    keyword linestart From\s brightred
    keyword <*@*> white
    keyword whole +@+ white
    keyword linestart To: brightmagenta
    keyword linestart Subject: brightred/Orange
    keyword linestart +: brown

context linestart Date:\s \n\n cyan
    keyword linestart From: brightgreen
    keyword linestart From\s brightred
    keyword <*@*> white
    keyword whole +@+ white
    keyword linestart To: brightmagenta
    keyword linestart Subject: brightred/Orange
    keyword linestart +: brown

context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightgreen
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightred
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightgreen
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightred
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightgreen
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightred
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightgreen
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightred
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightgreen
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightred
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightgreen
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightred
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightgreen
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightred
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightgreen
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightred
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightgreen
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightred
context linestart >\[\s\]>\[\s\]>\[\s\]>\[\s\]> \n brightgreen
context linestart >\[\s\]>\[\s\]>\[\s\]> \n brightred
context linestart >\[\s\]>\[\s\]> \n brightgreen
context linestart >\[\s\]> \n brightred
context linestart > \n brightgreen