Beyond the keyboard shortcuts and multiple account access, there are other features that enhance the Gmail experience. To add an attachment to a new message, simply drag and drop the file(s) to the Mailplane window. A new message window opens, with the files included as attachments. Drag and drop also works with composing a message.
If the attachments are photos, Mailplane will display an optimization slider that can control the size and quality of the attached image. [See Image 5] This makes sending a large image file much easier for novice users while conserving bandwidth for both the sender and recipient.
Most new Gmail features work without a patch or revision to Mailplane, as Mailplane uses a robust web browser as its core. On 5 June 2008, Google released several experimental features as part of Gmail Labs. These features are discussed in this Gmail blog article called Introducing Gmail Labs. Mailplane supports many of these features, including Superstars, which lets the user choose from several different colored stars and symbols.
Because Gmail changes so often, sometimes Mailplane fails to keep pace. One example is when a user receives a Microsoft Office document as a message attachment. When this review was written, Mailplane sometimes saved a Word document with a .doc.dot extension, instead of a .doc extension. The easiest way to resolve this issue was to rename the file in Finder after saving the attachment a folder or the desktop.
Mailplane does not provide offline access to Gmail messages, because the app doesn't download and store messages on the user's hard drive. This feature is unlikely to appear in Mailplane, so Mail.app or another IMAP-compliant mail client is a better choice for users who need regular offline access to their Gmail messages.