Mail Problem: can not read my emails

Dear all,

I am afraid that something happened with my email: I am a heavy user of Mail and I use to let all the messages there, even the ones which have attached file: I know then where I can find this files and even who send it to me.

The problem is that I do not how, in the list of emails I can see the first two lines of the message but if I select that message, nothing appears on the right side, just who send it to me and the date.

I only could see the messages that I sent, but not the ones that I received.

Can you help me?

Thank you very much

 

Fixed!!!

https://support.apple.com/kb/PH14958?viewlocale=en_US&locale=es_ES