If you use Zoho Mail with an iPhone, then a recent update should make you very happy!
1) New Dark Mode. This will mimic your iPhone’s settings in iOS 13, or you can shake your phone to make the setting go on/off.
2) New fonts! Several new fonts to change the style of your emails to your liking.
3) Scan attachments. If you have a paper document that you want to send as an attachment in your email, scan the document directly from the app and add it.
Enjoy!