A few more items have been included with today's 6.81 release.
133: Message sending bug
Fixed a long standing bug where messages sent to an unconfirmed email address would be delivered if that address was then deleted while still unconfirmed.
24862: Message to self sometimes does not get delivered
Fixed an issue which meant that a email message you sent to yourself in the Message Centre would sometimes not get delivered. This was because you would read it before the delivery service had a chance to deliver it, and the service only delivers unread messages.
24838: Seating plan - contact info for group owners
The seating plan admin group list now includes contact info for each group's owners.