You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: postman.rb
    path of file: ./repos/mailanes/objects
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

# Copyright (c) 2018-2024 Yegor Bugayenko
#
# Permission is hereby granted, free of charge, to any person ob
    
  def deliver(delivery, tbot: Tbot.new)
    letter = delivery.letter(tbot: tbot)
    recipient = delivery.recipient
    log = ''
    begin
      log = letter.deliver(recipient, @codec, delivery: delivery)
    rescue StandardError => e
      log = "#{e.class.name} #{e.message}; #{e.backtrace.join('; ')}"
      tbot.notify(
        'error', delivery.campaign.yaml,
        "⚠️ We just failed to deliver letter [##{letter.id}](https://www.mailanes.com/letter?id=#{letter.id})",
        "to the recipient [##{recipient.id}](https://www.mailanes.com/recipient?id=#{recipient.id})",
        "because of the error of type `#{e.class.name}`: #{e.message.inspect};",
        "you may find more details [here](https://www.mailanes.com/delivery?id=#{delivery.id})"
      )
    end