Font size in emails with HTML

Hi everyone,

I need to control the font size in an email whose body is generated by an expression rule that generates the corresponding html. The problem is that the font size that I specify in the html does not correspond to what the email finally has. For exmaple, this HTML <p style='font-size: 14px;'> Hola, la solicitud se ha completado y puede generarse el acuerdo en Vistex (adjunto fichero de carga)<p> should be 14 px. However in the emali the font-size is 10.5px.