Attachments

Postbox 3.0.5 contains some fixes to an issue that could cause attachments to be partially downloaded.  To make Postbox re-download the messages that already have this problem:

1) Quit Postbox 
2) Locate your Postbox profile folder: http://support.postbox-inc.com/entries/69230-postbox-profile-data 
3) Under <somestring.default>/ImapMail/<name of your imap account> locate the file called Inbox and Inbox.msf and drag them to your Trash folder. 
4) Restart Postbox - Postbox will re-download your imap inbox

Mountain Lion Features

Postbox 3.0.5 contains support for Mountain Lion's Notification Center and GateKeeper technologies.

Retina

Postbox 3.0.5 contains experimental support for high-definition fonts for Retina displays. Postbox does not contain improvements to graphics or unread message bubbles for Retina displays at this time.