NRR definition by Slang.net
This page explains what the acronym "NRR" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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In emails, NRR stands for "no reply required." Email senders use this acronym to indicate that they do not expect you to reply to their message.
Most often, NRR appears at the end of email messages, letting readers know they do not have to reply to the message they just read. NRR is similar to (but less commonly used than) the NNTR, NN2R, and NRN acronyms, all of which also tell readers they do not have to reply to a message.