Bad ESEARCH test mails

[shikharid]

https://github.com/dovecot/imaptest/blob/main/src/tests/esearch.mbox

These emails have no headers, not even a date header.

Any particular reason?

RFC 5322 clearly states that:

The only required header fields are the origination date field and the originator address field(s). All other header fields are syntactically optional.

So these emails should atleast have date and from headers