Using Twitter through e-mail

I've found a way to use my Iridium satellite phone to update Twitter while I'm roaming around the ocean. Mail2Twitter is a free service that allows you to use Twitter via e-mail. Since I can send 160-character e-mails through my sat phone, it seems like the perfect solution. The Twitter folks are checking for me to see if Iridium works with SMS delivery to the Twitter UK longcode number, but I'm unlikely to use Twitter this way because I don't want to have to change my registered mobile number and re-authenticate each time.