The Fleet Mail is a great addition to the game, but it needs to be a bit smarter.
Instead of just mailing each person who is in the guild, it should mail to the @accountname.
At first I thought it was a bug, but then I realised I have my alts in the fleet, so that's why I got multiple mails.
Or alternatively, if someone has multiple characters in the fleet, the mailer should "detect" this and just send 1 message to the common @accountname.
PS If this has already been mentioned, then I apologise, I couldn't find it through the search function.
I'd also like to put a plug in here for opening up the 24 hour restriction. One fleet mail per 24 hour period is ridiculous, to the point that fleet mail might as well not exist. Cryptic, if you insist on that kind of restriction, at least make it per PERSON or per ACCOUNT instead of per fleet.