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So, Gmail's IMAP is a bit 'weird'. They use IMAP folders to represent Labels. I believe typically that an email in IMAP can only belong to one 'Folder', however with Gmail, an email message can belong to many 'folders' which gives us very close functionality to labels.
My question is, I'm writing a gmail client (so that things like Starring, deleting, and archiving work a bit more intuitively than a standard imap client), but I would like to be able to display for a given email, which folders (labels) it is in.
As far as I can tell this is not easy (I'd have to loop through every message in every folder to see which ones it's in).
Does anyone know of a tidy way to do this? Or am I right in assuming there's no easy way?
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If you nested labels within other labels, select the small arrow to the left of the parent label to see them. If the labels are hidden in Gmail, use the More option at the bottom of the sidebar to find the one you want. You can also choose the search bar at the top of Gmail and type label:[name] to open the label.
Gmail Labels in IMAP ProgramsThe email client only displays in its subscription window those folders whose labels are actively shown in IMAP. If you change the list in your email program, those modifications do not sync back to Gmail.
Login to Gmail. If your entire list of folders is hidden on the left, ensure it is set to show by selecting the “Menu” at the upper-left corner of the screen. Also be sure that arrows are expanded in the left pane so you can see all folders.
Find Messages by a Specific Label You can filter emails that have a specific label. To do this, use the label: Gmail operator followed by the name of the label you're searching for.
Gmail provides a set of IMAP extensions to allow authors of IMAP clients provide a more Gmail-like experience through IMAP. See Gmail IMAP Extensions (X-GM-EXT-1).
To fetch the labels for a specific message you can call the IMAP FETCH command with the X-GM-LABELS attribute. See Access to Gmail labels: X-GM-LABELS
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