A bounced email ( simply a bounce ) is a email message from mail server (MTA) informing the sender of another message about a delivery error.
It is also called as a returned mail, an error email, and an undelivered mail. More information about bounced email is described in en.wikipedia.org/wiki/Bounced_e-mail .
The first appearance: bouncehammer.jp/en/what-is-bounced-email
A bounced email have the following features.
A bounced email is created by MTA ( Such as Sendmail, Postfix, and qmail ) automatically when delivery error occurred. Contents of the subject header of bounced email like followings.
A sender of bounced email is mainly a postmaster or a MAILER-DAEMON. You will find names like the followings in From: header of bounced email.
A bounced email is created by mail server program such Sendmail, and contains delivery report in its message body. Sisimai reads a bounced email and parse its headers and its message body, then find details about why the delivery failed. The following section is particularly important to find details for Sisimai.
Sisimai is a library which parses a bounced email, finds a reason of bounce.