Shen Li

Attachments are posted to the designated endpoint together with the email by Mailgun. We can get the value of `attachment-count` in the posted data. The attachments are named from `attachment-1`...

Return None values as None in ListSerializer.to_representation

2

## Description I recently encountered some unexpected behavior when using ListSerializer when there are `None` values in the list. Here's a snippet that describes the issue and provides a way...