/usr/share/mc/syntax/mail.syntax is in mc-data 3:4.8.3-10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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
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