What is mailer daemon failure notice?

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Tags

1. #mailer
2. #means
3. #automatically
4. #failure
5. #messages
6. #subject
7. #usually
8. #failed
9. #reason
10. #daemon
11. #these
12. #undeliverable
13. #bounced
14. #delivery
15. #similar
16. #include
17. #subsystem
18. #produced
19. #message