FetchBodySection extracts a body section from a message.

FetchBodyStructure computes a message's body structure from its content.

FetchEnvelope returns a message's envelope from its header.

Match returns true if a message matches the provided criteria.

MatchDate returns true if a date matches the provided criteria.

MatchFlags returns true if a flag list matches the provided criteria.

MatchSeqNumAndUid returns true if a sequence number and a UID matches the provided criteria.

UpdateFlags executes a flag operation on the flag set current.