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instance method

Net::POPMail#uidl

uidl

# File tmp/rubies/ruby-3.0.5/lib/net/pop.rb, line 874
def unique_id
  return @uid if @uid
  @pop.set_all_uids
  @uid
end

Returns the unique-id of the message. Normally the unique-id is a hash string of the message.

This method raises a POPError if an error occurs.