Easy for you to say... I forgot my towel!
[/hitchhiker references]
Anyone intending to write (on old fashioned paper and sent with a postage stamp) to their critters or to Obama should do so on a plain postcard.
Letters in envelopes, when sent to FedGov folks, don't get opened for weeks or months. This is due to screening for biological or chemical contaminants that "could" be in the envelope. A postcard has no such threat.
A paragraph on a postcard, folks.