It is not really very easy for an English speaker to see (or hear) any MEANING in these double letters but obviously sometimes letters are doubled in Italian. So, it is probably a good idea to double a letter every now and then, especially if an Italian letter is likely to be double in that position. For example, an English speaker would be likely to know that Italian has words spelled "tarantella" and "bella" and so forth. Those things might even come to mind when writing to an Italian in Italy. That makes it seem "logical" to call you "Emanuella" with two ells.
chow,
- ph