Email PDFs created are named in the format shown here, which includes the email date and the subject of the email. The emails have the full technical header embedded at the bottom in small print. This is useful for legal and other purposes. Emails are filed in subfolders for year and month.
Attachments are saved in a folder with the same name as the email. This allows for easy searching and followup.
Below I include a screenshot of typical output as seen in the Finder. Emails are output by year and month, and if an email has attachments, then they are put into a folder with the same name.