"No More Heroes III" contains an e-mail system, similar to past Grasshopper games such as "The Silver Case" or "BLOOD+ One Night Kiss".
But, if you've played through the game, you probably noticed it is hardly actually used.
The mails are divided into three categories, "Important", "Tutorial" and "Spam".
"Important" mails are those sent from the UAA to alert you of ranking fees and are almost all uniform.
The "Tutorial" mails are merely archives of Meijin's tips, which you have already read.
The "Spam" e-mails would seem promising, but they only consist of joke e-mails from "Notflix" and, the most interesting ones, those of Doppelganger.
It might seem odd that the system is not utilized more.
But, there are actually several unused e-mails in the game files, fully translated into every language.
Some of them refer to content still in the game; others are more mysterious.
Presented here for your pleasure is every unused e-mail in No More Heroes III!
(Special thanks: @Transmitter51 for providing the game files.)
[※ Since these are taken from raw hex files opened in a text editor, some emoticons or borders would display differently in-game.]

This is placed under the normal Important mails and before Henry's.
In the actual game, Sylvia is evasive and mysterious. She never properly meets with Travis.
So what could she possibly have wanted to give him?

The rest of the unused mails are organized after all the used Spam mails.

On its surface, does not seem to refer to any mission in the final game.
However, there are volunteer missions where Travis picks up trash from ponds.
Perhaps the concept originally involved picking up treasure? ※Speculation

Refers to the Greenification volunteer mission.

The character Chris from "Flower, Sun, and Rain" is a talking alligator.
There are alligators in "No More Heroes III", but no talking ones as far as I know.
Was Chris intended to appear in this game...?!

A ramen-focused volunteer mission does exist in-game, but with a very different feeling.
However, it's possible that this mail would point you to somewhere that would begin essentially the same mission.
Or maybe it's just spam.

Naturally refers to the lawn-mowing missions.
However, the description suggests Travis would be mowing a large, stadium-sized area.
In the game itself, Travis mows three separate, smaller lawns.
As a side note, this is the third Santa Destroy baseball team to be mentioned across the games in total...

Refers to the mission to destroy the moai heads, which are still referred to as alien "shells".
Also a reference to "They Live" and its director, John Carpenter.

Refers to the Coast Guard missions.
Also, um... yeah....

Seems to be merely humorous, but going by the other examples, it's possible it may have lead to the DeathMan card mission.

In the game, there are three space battles with alien monsters as optional boss fights.
However, there isn't really an indication of their existence - they are hidden in the optional Designated Matches.
These three unused e-mails would have actually told you about them and pointed towards where to fight them.

Another optional boss in the game is Ryuichi.
Ryuichi can only be unlocked by getting a Gold rank on every driving mission, which is not indicated in any way.
It is revealed that he is the leader of the gang you had been fighting in the driving missions.
These e-mails suggest that the driving missions would have been a more clearly-indicated questline,
in which you do battle with Ryuichi's gang members, who are all named after motorcycle manufacturers.
In light of this it's likely they would have been riding motorcycles instead of driving cars as well.

Other fun facts of unused text...

written by meru 9/5/2021