Open the email you want to save
Click the print option
Select Save as PDF or Microsoft Print to PDF
Choose the destination folder
Click Save
On Gmail, open the email and click the three-dot menu
Select Print
Change the destination to Save as PDF
Click Save
On Outlook, open the email and click File
Select Print
Choose Microsoft Print to PDF
Click Print and save the file
On Apple Mail, open the email and click File
Select Print
Click the PDF menu
Choose Save as PDF
Enter a file name and save it