How do you prevent seamonkey 2.0 from opening mail?

[user]

I like to select and delete unwanted e-mail before I start to read the 
ones I am interested in but when I right click the mouse to select the 
e-mail for deletion and hit enter to delete it or them the next e-mail 
in line opens up and I would prefer that it did not until I select it. 
Is there a way to stop it from opening the next e-mail until I select it.

Thanks
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