Only prints to and from addresses.
What version of eM Client are you using?
Current version.
Current version means what? There are 4 to choose from.
Windows:
Current beta = 8.0.1785
Current release = 7.2.38732
Mac:
Current beta = 8.0.1752
Current release = 7.2.37965
Sorry Windows current release 7.2.38732. Also customer is using a Pop3 account.
I tried to reproduce it but was not able. eM Client does rely on an updated OS to work, especially .NET. If the user could update their OS then try again.
If that still does not work, and they have a Pro License, they should open a support ticket with eM Client.
Or maybe even try out the version 8 beta.