Afterward, restart the app in question.

!! Turn off bounce

!!! Globally

{{{
$ defaults write -g NSScrollViewRubberbanding -int 0
}}}

!!! App Specific

{{{
$ defaults write com.apple.mail NSScrollViewRubberbanding -int 0
}}}

!! Restore bounce

!!! Globally

{{{
$ defaults delete -g NSScrollViewRubberbanding
}}}

!!! App Specific

{{{
$ defaults delete com.apple.mail NSScrollViewRubberbanding
}}}

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[Mac | CategoryComputing.Mac]