The RFCs that define Internet mail apply only to messages in transit
between hosts. They specify that lines of text should be terminated by
the two-character sequence CR, LF. When a message is within a host
system, the software that processes it may use any method it likes for
terminating lines. The natural assumption is to use the host's normal
convention. Most software on Unix-like systems uses a single LF
character, which is the Unix standard.
When a non-SMTP message is passed to Exim via its command line, LF
termination is assumed. Any CR characters in the message, wherever they
appear, are treated as data characters.
Unfortunately, not all software writers take the same view. At least
one MUA (dtmail) terminates each line with CR, LF, and the Cyrus
message store behaves in the same way. There is also some UUCP software
which does this. To support these callers, Exim has the -dropcr option,
which causes it to discard a CR character if it immediately precedes an
LF. Any other CR characters are treated as data. For example, a
sequence such as CR, CR, LF is treated as one data CR, followed by the
end of the line. The "drop_cr" configuration file option can be used to
force -dropcr for all non-SMTP input.
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