I seem to be having the same issue, but just signed up so will sit for a day and see if it irons it out. Plain text came in ok like the welcome to nokia messaging email but all my other stuff has html or images in it and it only loads the first screens worth of data. The service is also very slow for me. Email takes a long time to load while the POP3 versions I have setup on alternate accounts load very quickly.

I dont even seem to see the email in my inbox on nokia messaging when I get the alert, have to wait a while. Im on my high speed wi-fi at home too so net speed is not a problem.

I do not think I am going to rely on this service anyways since its just a trial, paying for it would be a bit much (unless its very cheap) I can live with POP3 if I must and I am sure there is or will be a free application that can use email push besides nokia messenger.