Description:
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From manual page: http://www.php.net/function.mail
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manual says:
>  Each line should be separated with a CRLF (\r\n). Lines should not be larger
>  than 70 characters. 

which is completly wrong.

\r\n is not applicable to posix platforms. on linux it should be \n
else the generated SMTP message gets \r doubled 


70 character limit is for encoded MIME content only. RFC5322 allows 998 cahacters per line in non-MIME content but reccomends 78 as the limit.