Zoho webmail changes markup of HTML emails

Zoho webmail changes markup of HTML emails

We're seeing issues with some HTML emails when viewing them through the Zoho web mail client ... Zoho appears to be stripping attributes on anchor tags (aside from the href) and then adding in a target="_blank"

It's quite annoying as it really messes with the display of emails where anchor tags have been styled and makes them illegible.

I can understand adding the target="_blank", but why does it strip all other attributes?