How can I convert Emails in PDF format?

When you open an email, on the top right of the email, you have 3 vertical dots. Once you click on that, you will have many options and a print option as well. Please click on 'Print'

A printer dialogue box will be opened.

Then, Select 'Destination' as 'Save as PDF' and then click 'Save'.

Yay.!

Your PDF file can be saved now.