A New-Line format.
MimeKit (in MimeKit.dll) Version: 3.0.0
public enum NewLineFormat
The Unix New-Line format ("\n").
The DOS New-Line format ("\r\n").
A mixed New-Line format where some lines use Unix-based line endings and
other lines use DOS-based line endings.
There are two commonly used line-endings used by modern Operating Systems.
Unix-based systems such as Linux and Mac OS use a single character ('\n' aka LF)
to represent the end of line where-as Windows (or DOS) uses a sequence of two
characters ("\r\n" aka CRLF). Most text-based network protocols such as SMTP,
POP3, and IMAP use the CRLF sequence as well.