Approximate (facultative) name of icon:

001.	add mail
002.	remove mail
003.	check mail
004.	delete mail
005.	favorite mail
006.	move mail left
007.	move mail right
008.	move mail down
009.	move mail up
010.	mail options
011.	edit mail
012.	receive mail
013.	send mail
014.	forward mail
015.	redirect mail
016.	multiply forward
017.	refresh mail
018.	flag / priority blue
019.	flag / priority green
020.	flag / priority yellow
021.	flag / priority red
022.	search mail
023.	receive mail 2
024.	send mail 2
025.	send all
026.	mail
027.	save mail
028.	mail attention
029.	stop mail
030.	lock mail
031.	unlock mail
032.	favorite mail 2
033.	postcard
034.	address book
035.	spam
036.	rss mail
037.	temporary
038.	mail with attachment
039.	mails
040.	move mail upfront
041.	move mail to back
042.	attachment
043.	opened mail