johnny, you added the following strings in /plugins/mail-notification/mail-notification.c, rev34702:

if (!status_count) {
     char *folder;
     status_count = t->new;

     folder = em_utils_folder_name_from_uri (t->uri);
     msg = g_strdup_printf (_("You have received %d new messages\nin %s."),
         status_count, folder);
     
     g_free (folder);
} else {
     status_count += t->new;
     msg = g_strdup_printf (_("You have received %d new messages."),
         status_count);
}

1) please read http://live.gnome.org/TranslationProject/DevGuidelines/Plurals and add proper ngettext support.
2) %s is the folder, and for nearly every account this folder is named INBOX here. i wonder if it makes sense to use the account instead.
3) a translator comment could also be nice. is "%s" a folder, an account, or is it "You have received 90 new messages in 4 hours."?
3) if you fix these strings, please announce the string change to gnome-i18n@.