Documentation

https://docs.python.org/3/library/email.message.html#email.message.EmailMessage.defects

The defects attribute contains a list of all the problems found when parsing this message. See email.errors for a detailed description of the possible parsing defects.

It actually does not include defects in the message headers (#106144, #90169). Until these issues are fixed, the documentation should state that header defects are not included in email.Message.defects.

Linked PRs

• gh-128568: fix documentation of email.Message.defects #128569