Do real mail delivery styem failures go to spam

What an interesting question!

In the context of email, "spam" refers to unsolicited commercial emails or messages that are sent in bulk to a large number of recipients. These emails are often unwanted and can be considered junk mail.

In the context of mail delivery, "spam" is not a term typically used to describe failed mail delivery attempts. Instead, failed mail delivery attempts are usually referred to as "undeliverable" or "returned" mail.

When a mail delivery system fails to deliver a piece of mail, it is typically because the address is invalid, the recipient has moved, or the mail is undeliverable for some other reason. In these cases, the mail is usually returned to the sender or held at the post office for pickup.

So, to answer your question, no, real mail delivery system failures do not go to "spam" (in the email sense). Instead, they are typically handled through the mail delivery system's processes for handling undeliverable mail.

However, it's worth noting that some email services may use the term "spam" to describe failed mail delivery attempts, particularly if the email is flagged as spam by the recipient's email provider or if the email is sent to a non-existent email address. In these cases, the email may be marked as "spam" and not delivered to the recipient's inbox.