While Postbox has its own power-user keyboard shortcuts, you can continue using Gmail shortcuts you're used to within Postbox. To switch them on, go to Postbox (macOS/Tools (Windows) > Preferences/Options > Advanced and checkmark Use Gmail shortcuts. To return to Postbox's shortcuts, uncheck the box.
Here are the keyboard shortcuts in Postbox when Gmail shortcuts are turned on.
| Message List Pane | macOS | Windows |
|---|---|---|
| Go to Home screen | shift + command + H | Alt + Home |
| Go to Next message | J | J |
| Go to Previous message | K | K |
| Go Back to Last-Viewed Message | [ | [ |
| Return to Current Message | ] | ] |
| Go to Next Unread Thread | shift + T | Shift + T |
| Expand all conversations in the Message List pane | * | * |
| Collapse all conversations in the Message List pane | \ | \ |
| Expand selected collapsed conversation in the Message List pane | right arrow | right arrow |
| Collapse selected expanded conversation in the Message List pane | left arrow | left arrow |
| Expand selected conversation in the Message pane | O | O |
| Collapse selected conversation in the Message pane | shift + O | Shift + O |
| Move to the Search bar | / or command + K | / or Ctrl + K |
| Toggle Inspector pane for selected message | shift command + I | Ctrl + Shift + I |
| 3-Pane Navigation | macOS | Windows |
| Move from pane to pane | F6 | F6 |
| Select the next message unit in a conversation in the message pane | Alt + Down Arrow | |
| Select the previous message unit in a conversation in the message pane | Alt + Up Arrow | |
| Switch tabs | command + 1-9 | Ctrl + 1-9 |
| Move to next tab | control + tab | Ctrl + Tab |
| Move to previous tab | shift + control + tab | Ctrl + Shift + Tab |
| Advanced Search | shift + command + K | Ctrl + Shift + K |
| View Messages | option + command + L | Ctrl +Alt + L |
| View Attachments | option + command + A | Ctrl + Alt + A |
| View Images | option + command + I | Ctrl + Alt + I |
| Address Book window | shift + command + B | Ctrl + Shift + B |
| Folder pane toggle | shift + command + M | Ctrl + Shift + L |
| Focus pane toggle | shift + command + P | Ctrl + Shift + P |
| Find in This Message | command + F | Ctrl + F |
| Find Again in message | command + G, or F3 | Ctrl + G, or F3 |
| Find previous in message | shift + command + G or Shift + F3 | Ctrl + Shift + G, or Shift + F3 |
| Close Tab | command + W | Ctrl + W |
| Close Window | command + Shift + W | Ctrl + Shift + W |
| Open Preferences/Options | command + , | |
| Quit/Exit | command + Q | Ctrl + Q |
| Minimize | command + M (not available in full-screen mode) | |
| Hide | command + H | |
| Increase text size | command + + | Ctrl + + |
| Decrease text size | command + - | Ctrl + - |
| Restore text size | command + 0 (zero) | Ctrl + 0 (zero) |
| Message Commands | macOS | Windows |
| New Message (default format) | C | C |
| New Reminder | shift + command + N | Ctrl + Shift + N |
| Open Message | command + O | Ctrl + O |
| Archive | E | E |
| Quick Folder Switch | G | G |
| Quick Move | V | V |
| Quick Reply | shift + R | Shift + R |
| Send an Existing Quick Reply | command + enter | Ctrl + Enter |
| Send and archive Quick Reply (PB 3 and higher) | Command + Shift + Option + Enter | Ctrl + Shift + Alt + Enter |
| Cancel an Existing Quick Reply | esc | Esc |
| Quick Search (macOS) | / | / |
| Move to the Search bar (Not available in Quick Reply) | command + K | ctrl + K |
| Assign a Topic | T | T |
| Assign a Label (PB 3 and higher, for Gmail accounts only) | L | L |
| Add/Remove a Favorite Topic | 1 to 9 | 1 to 9 |
| Remove All Topics from a Message | 0 | 0 |
| Mark/unmark as Reminder | S | S |
| Mark Message as Read/Unread | M | M |
| Mark Message as Pending/Not Pending | shift + M | Shift + M |
| Mark All Read | shift + C | Shift + C |
| Mark Thread as Read | R | |
| Mark as Junk toggle | J | Shift + J |
| command + P | Ctrl + P | |
| Copy | command + C | Ctrl + C |
| Delete | delete | Del |
| Delete immediately (skip Trash folder) | shift + delete | Shift + Del |
| Select All | command + A | Ctrl + A |
| Select Thread | shift + command + A | Ctrl + Shift + A |
| Undo | command + Z | Ctrl + Z |
| Redo | command + Y | Ctrl + Y |
| Edit a message | command + E | Ctrl + E |
| Forward Message | F | F |
| Reply to Message | R | R |
| Save As Draft | command + S | Ctrl + S |
| Get New Mail For All Accounts | shift + command + D | Ctrl + Shift + D |
| Get New Mail For Account | command + T | Ctrl + T |
| View Message Source | command + U | Ctrl + U |
| Message Composition | macOS | Windows |
| Add an Attachment | shift + command + A | Ctrl + Shift + A |
| Cc Field | option + command + C | Ctrl + Alt + C |
| Bcc Field | option + command + B | Ctrl + Alt + B |
| Reply-To Field | option _ command + R | Ctrl + Alt + R |
| Toggle Summary mode | command + O | Ctrl + O |
| Toggle recipients between Reply and Reply All | shift + command + R | Ctrl + Shift + R |
| Create a new message | C | C |
| Send Now | shift + command + D | Ctrl + Return |
| Send Later (Message is placed in the local Unsent folder) | shift + command + return | Ctrl + Shift + Return |
| Save As Draft | command + S | Ctrl + S |
| Close Window | command + W | Ctrl + W |
| command + P | Ctrl + P | |
| Quick Bar | command + L | Ctrl + L |
| Insert a Link | shift + command + L | Ctrl + Shift + L |
| Message Composition - Text Editing | macOS | Windows |
| Undo | command + Z | Ctrl + Z |
| Redo | shift + command + Z | Ctrl + Shift + Z |
| Cut | command + X | Ctrl + X |
| Copy | command + C | Ctrl + C |
| Paste | command + V | Ctrl + V |
| Paste without Formatting | shift + command + V | Ctrl + Shift + V |
| Rewrap | command + R | Ctrl + R |
| Select All | command + A | Ctrl + A |
| Find and Replace | command + F | Ctrl + F |
| Find Again | command + G | Ctrl + G |
| Find Previous | shift + command + G | Ctrl + Shift + G |
| Message Composition - Text Formatting | macOS | Windows |
| Bold | command + B | Ctrl + B |
| Italics | command + I | Ctrl + I |
| Underline | command + U | Ctrl + U |
| Fixed Width (toggle) | command + T | Ctrl + T |
| Discontinue Text Styles | shift + command + Y | Ctrl + Shift + Y |
| Discontinue Link | shift + command + K | Ctrl + Shift + K |
| Increase Indent | command + ] | Ctrl + ] |
| Decrease Indent | command + [ | Ctrl + [ |
| Make text Larger | command + + | Ctrl + + |
| Make text Smaller | command + - | Ctrl + - |
| Restore text size | command + 0 (zero) | Ctrl + 0 (zero) |