Improved handling of emails with non-english characters

FastMail has long handled emails with non-english characters that are RFC compliant correctly. Unfortunately many email clients generate non-RFC compliant emails which are technically incorrect (“broken”). We continue to try and add workarounds to make these emails display better. We added a few changes today that should make certain such emails that previously displayed incorrectly now display correctly. Since the number of possible ways that an email can be “broken” is infinite, we can never guarantee that we have dealt with all cases, and we will continue to work on such emails as we encounter them.