What is a web version?
You will often see at the top of an email a piece of text which says something like “If you cannot see this email properly click here”.
This will link to a version of the email in the browser and is often referred to as the web version.
Why is it needed?
Different email clients render emails in different ways. Some might mess up the formatting so it is not legible. This is certainly the case with some mobile email clients although thankfully this is quickly changing.
The other reason is if images are not displayed. While some recipients will know how to turn images on, it is sensible to give people this additional option.