A FetchProfile is a list of items that should be downloaded in bulk for a set of messages.
FetchProfile can contain the following objects:
FetchProfile.Item: Described below.
Message: Indicates that the body of the entire message should be fetched.
Synonymous with FetchProfile.Item.BODY.
Part: Indicates that the given Part should be fetched. The provider
is expected have previously created the given BodyPart and stored
any information it needs to download the content.
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