get email unread content, without affecting unread state [duplicate]

This questi开发者_JS百科on already has answers here: Fetch an email with imaplib but do not mark it as SEEN (4 answers) Closed 6 years ago.

Right now its a gmail box but sooner or later I want it to scale.

I want to sync a copy of a live personal mailbox (inbox and outbox) somewhere else, but I don't want to affect the unread state of any unread messages.

what type of access will make this easiest? I can't find any information if IMAP will affect the read state, but it appears I can manually reset a message to unread. Pop by definition doesn't affect unread state but nobody seems to use pop to access their gmail, why?

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In the IMAP world, each message has flags. You can set the individual flags on each message. When you Fetch a message, it's actually possible to read the message, without applying the \Seen flag.

Most mail clients will apply the \Seen flag when the message is read. So, if the message has already been read, outside of your app, then you will need to remove the \Seen flag.

Just as fyi...here is the relevant part about flags from the RFCs:

A system flag is a flag name that is pre-defined in this specification. All system flags begin with "\". Certain system flags (\Deleted and \Seen) have special semantics described elsewhere. The currently-defined system flags are:

    \Seen
       Message has been read

    \Answered
       Message has been answered

    \Flagged
       Message is "flagged" for urgent/special attention

    \Deleted
       Message is "deleted" for removal by later EXPUNGE

    \Draft
       Message has not completed composition (marked as a draft).

    \Recent
       Message is "recently" arrived in this mailbox.  This session
       is the first session to have been notified about this
       message; if the session is read-write, subsequent sessions
       will not see \Recent set for this message.  This flag can not
       be altered by the client.

       If it is not possible to determine whether or not this
       session is the first session to be notified about a message,
       then that message SHOULD be considered recent.

       If multiple connections have the same mailbox selected
       simultaneously, it is undefined which of these connections
       will see newly-arrived messages with \Recent set and which
       will see it without \Recent set.

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There is a .PEEK option on the FETCH command in IMAP that will explicitly not set the /Seen flag.

Look at the FETCH command in RFC 3501 and scroll down a bit to page 57 or search for "BODY.PEEK".

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You need to specify section when you use BODY.PEEK. Sections are explained in IMAP Fetch Command documentations under BODY[<section>]<<partial>>

import getpass, imaplib

M = imaplib.IMAP4()
M.login(getpass.getuser(), getpass.getpass())
M.select()
typ, data = M.search(None, 'ALL')
for num in data[0].split():
    typ, data = M.fetch(num, '(BODY.PEEK[])')
    print 'Message %s\n%s\n' % (num, data[0][5])
M.close()
M.logout()

PS: I wanted to fix answer given Gene Wood but was not allowed because edit was smaller than 6 characters (BODY.PEEK -> BODY.PEEK[])

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Nobody uses POP because typically they want the extra functionality of IMAP, such as tracking message state. When that functionality is only getting in your way and needs workarounds, I think using POP's your best bet!-)

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if it helps anyone, GAE allows you to receive email as an HTTP request, so for now i'm just forwarding emails there.

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To follow up on Dan Goldstein's answer above, in python the syntax to use the ".PEEK" option would be to call IMAP4.fetch and pass it "BODY.PEEK"

To apply this to the example in the python docs :

import getpass, imaplib

M = imaplib.IMAP4()
M.login(getpass.getuser(), getpass.getpass())
M.select()
typ, data = M.search(None, 'ALL')
for num in data[0].split():
    typ, data = M.fetch(num, '(BODY.PEEK)')
    print 'Message %s\n%s\n' % (num, data[0][5])
M.close()
M.logout()