Mailroom.IMAP.fetch

You're seeing just the function fetch, go back to Mailroom.IMAP module for more information.
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fetch(pid, number_or_range, items_list, func \\ nil, opts \\ [])

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Fetches the items for the specified message or range of messages

Examples:

> IMAP.fetch(client, 1, [:uid])
#…
> IMAP.fetch(client, 1..3, [:fast, :uid])
#…