For those who are sending emails to customers and suppliers from Manager, I know email deliverability is very important to you so the latest version (14.5.11) is now able to track whether your emails sent from Manager have been actually viewed by recipients.
When sending email, check the option
Tracking enabled (you can go to
Email settings to make this option checked by default)
All sent emails will be added to new tab called
Emails. This will allow you review past emails that have been sent.
If tracking is enabled, you will be also able to see status of each email (“Not viewed” or “Viewed - date/time”). See example: