Uncomplex has released Mailplane 3.2 with a variety of improvements to the Gmail-specific email client. The update now enables you to edit an attachment and then send the edited document in a reply. It also adds support for inline images (added via drag-and-drop, pasting, or using the Mail > Insert command), automatically detects the correct inbox type setting for your notifier (and ensures the tab count and notifier are always in sync), adds support for custom notification sounds, ensures that new email generated from Safari’s Email This Page no longer truncates the URL, and avoids a crash when uploading an image in Hangout Chat. ($24.95 new, free update, 17.3 MB, release notes, 10.7+)
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- Mailplane 3.2.1 (19 May 14)
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As Adam explained, implementing it properly (forging email headers) doesn't fit well with our approach (non IMAP). I don't really like it but more likely will be a "Doing a forward and adjusting the message" workaround. But no promises, yet.
If the comments are appropriate for a feature request, I would add a desire (that would be simple to add, I suspect), it would be a link to the Gmail "Cheat Sheet" so that when one wants to search within a Gmail account via Mailplane, the user can readily get the full set of commands. The English language link is this: https://support.google.com/mail/answer/7190?hl=en.