代表签名档的开始的 -- 应该是 --(空格)(换行)
http://en.wikipedia.org/wiki/Signature_block
The formatting of the sig block is prescribed somewhat more firmly: it should be displayed as plain text in a fixed-width font (no HTML, images, or other rich text), and must be delimited from the body of the message by a single line consisting of exactly two hyphens, followed by a space, followed by the end of line (i.e., "-- \n").[1] This latter prescription, which goes by many names, including "sig dashes", "signature cut line", "sig-marker", "sig separator" and "signature delimiter", allows software to automatically mark or remove the sig block as the receiver desires. The signature prefix chosen can be different for different people serving as a distinguishing feature of their signatures. A correct delimiter is required for a news posting program to receive the Good Netkeeping Seal of Approval.
没有这个空格,(正常的)处理邮件的系统就认不出那是个签名档。
--
FROM 202.201.11.*