How do I mark mail as read in Lotus Notes without actually opening the email?
Select your email messages and under Edit -> Unread Marks -> Mark Selected Read
will do it.
Update
Pulled up comment from @Leons
Under Notes 8.5, you can make the behavior default in:
File > Preferences > Basic Notes Client Config
and check the box in the Additional Options
list box:
[x] Mark documents read when opened in preview pane
You can also hit the insert key to toggle read status.
The best way is to go to Preferences > Basic Notes Client Configuration > Additional Options > Mark documents read when opened in preview pane.