What's the message's UID in the message storage of cyrus imapd.

[Penghui Wang]

Hi,

 In the document of cyrus imapd package, there are something describe the
message files in the message storage.   *message files * *There is one file
per message, containing the message in RFC 822 format. Lines in the message
are separated by CRLF, not just LF. The file name of each message is the
message's UID followed by a dot (.). *

I have googled for a while, but have got anything useful to explain what is
the message's UID.

Could someone pick me up?

Thanks very much.


Penghui Wang
Xiamen China
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