An Amazon drone delivered its first package Wednesday, which officially means the robots are coming for our jobs.

And to rub more salt in the wound for U.S. postal workers, job search platform CareerCast's new report of the 10 jobs with the worst growth outlook between now and 2024 found mail carriers to be the most endangered. Like many of the other positions on the list, automation is mostly to blame.

Even with unemployment in the U.S. at a nine-year low, there's no doubt we're in the midst of a shift in the kinds of jobs that will be available moving forward, thanks to technology, market preferences, and incentives to outsource. Typist, meter reader, and radio DJ, for example--which are expected to experience, respectively, an 18 and 11 percent decline in number of jobs through 2024 -- are just four of the top professions that are quickly losing a human touch mainly due to advances in technology. Jewelers and seamstresses, whose jobs are expected to decline by 11 and 9 percent, respectively, are also less necessary, as factories adopt more automation.

But the bots can't shoulder all the blame for lost jobs in America; market preferences and cost-efficient outsourcing are just as responsible. While automated sorting and delivery has undoubtedly taken a toll on the career trajectory of mail carriers, whose jobs the report says will decline 28 percent by 2024 to become the most endangered job in America, the biggest culprit is email, text messaging, and social media. The low-cost platforms have become preferred ways to stay in touch for many. And that grim job outlook for jewelers and seamstresses? It's partially due to the cost saving benefits of outsourcing these roles.

Not even computer programmers are safe. Making the list at No. 10, demand for the traditionally recession-proof position could wane by 8 percent. That's because Bureau of Labor Statistics data shows that for fundamental programming positions, it's much cheaper to outsource. Rest assured, Python programmers, the job market for more specialized jobs in IT will remain strong in the U.S.

Less surprisingly, since you are reading this online and not in print, newspaper reporters should expect a difficult job market, with the report saying old-school newsrooms will shrink by 8 percent by 2024.

Here's the full list of the top 10 endangered jobs in America, in order of expected decline in job growth outlook by 2024:

  1. Mail Carrier
  2. Typist/Word Processor
  3. Meter Reader
  4. Disc Jockey
  5. Jeweler
  6. Insurance Underwriter
  7. Seamstress/Tailor
  8. Broadcaster
  9. Newspaper Reporter
  10. Computer Programmer