Postfix: User's real / full name with accented character

I'm just in the process of setting up Postfix on my Linode and, although the install seems to be working OK so far, I've run into a bit of a problem:

My real name has an accented character in it "í". Whenever I send an email through postfix on my Linode and receive it on my laptop, the sender comes through as My Full Name<mynickname@mydomain.com>, but with the accented character in my full name replaced with a "Ã". Now, I'm not sure where Postfix is getting my full name from to associate it with my email address, as I've not configured that anywhere. I'm assuming that ­Postfix is reading my full name from /etc/passwd which is the only place I can think of where it is configured on the server.

Assuming the above is true [which it seems to be as changes made in [i]/etc/passwd are reflected in what Postfix sends]: My full name is spelled correctly with the accented character in /etc/passwd so it seems something is 'slipping twixt cup and lip' between /etc/passwd and Postfix. I've tried replacing the accented character in my full name in /etc/passwd with the appropriate unicode entity but that didn't work, the from address on the sent email just included the unicode entity 'as is'. Backslashing didn't work either.

There isn't a problem with unicode support in Postfix itself per se as, when I send an email with accented chars in the title or body they come through OK. It's just the sender full name that's getting messed up.

Any ideas, anyone?