Exception ("Index 2 >= 2") when sending message

[octo]

When sending an Email message, the following happens:

1. The message is successfully sent
2. An ArrayIndexOutOfBoundsException is generated, with the message "Index 2 >= 2".
3. The message remains in the outbox.

This was reproduced using a configuration where the base account was IMAP, the sent message folder was set to both "<none>" and a local folder.

[octo]

Change [632] should fix this, which is available in build [build:161].