How to extract headers from emails using iMAP?

Question

PHP

Good afternoon. It is necessary to extract from the letter the text "The letter was sent to a non-existent address [email protected]". However, this line is not in the body of the letter, the heading in the open letter is also different. I tried to pull information from many parts of the letter, but the required fragment could not be found. Does anyone have any thoughts on this? Thank you.

Answer 1

Most likely, there is no such text in principle, and what you see is not a letter, but a human-readable representation of the DSN. The DSN format is described in https://tools.ietf.org/html/rfc3464
To get the same information directly from an email, you need to implement parsing of emails in the DSN format yourself.