This should work fine unless you are sending Internet mail as CD with CD to MIME conversion happening at the server. If this is the case then you can choose any font you like and the recipient will still see the default font because CD to MIME does not preserve font characteristics (or in-line images).
Solution - ensure that you send Internet mail in native MIME from the Notes client.
The silly problem is that we are trying on a pc in which doesn’t work fine something for hours…Today we have tried on others pc in our net and the format is right while we are sending the message and who receives can see the format ih the right way, then it isn’t an incorrect configuration on the server, but “something” on this particular pc. Any idea?