Newbie question; Multiple email accounts (18), one EagleFiler library or seperate?

I currently have 18 separate email accounts in mailmate. When setting up eaglfiler should I have separate libraries for each, or should I put them all in one library to facilitate searching.

I would use a single library—as that should be much simpler—unless you have an organizational reason for keeping the mail from the different accounts separate.

Thank you. I was initially thinking individual but as I thought about it, I decided to ask. Your prompt response is also very much appreciated.