NNTO
NNTO definition by Slang.net - The Slang Dictionary
This page explains what the acronym "NNTO" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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When you see NNTO in an email's subject line, it means there's "no need to open" that email. The email's subject is its message (SIM), so opening the email would be a waste of time - because it has no body text.
Typically, people include NNTO at the end of short messages that fit in an email's subject line, such as "Nice job!" or "Thank you!" They also often place NNTO in brackets (< >), to separate it from the email's actual message.