In the RFC 1725 (Standard rules for POP3 protocol), it is said that every message sent by the pop3 server is terminated by a CRLF pair.
What's that, and how to recognize it while receiving?
The "\n" is a line feed. Think \n = new line. The "\r" is a carriage return. In some OS's the line feed also does a carriage return so \n is like CRLF on those.
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