Spell Check Not Working in Airmail on Mac

<h2>Problem</h2><p>The "Check Spelling While Typing" option doesn't work in Airmail, or spell check is not underlining misspelled words in the composer.</p><h2>Solution</h2><p>Airmail uses the <strong>macOS system spell checker</strong>. If spell check isn't working in Airmail, the issue is usually with the macOS-level settings.</p><h3>Fix macOS Spell Check Settings</h3><ol><li>Open <strong>System Settings</strong> (or System Preferences)</li><li>Go to <strong>Keyboard → Text Input → Input Sources → Edit</strong></li><li>Make sure <strong>"Correct spelling automatically"</strong> is enabled</li><li>Also check that <strong>"Check spelling while typing"</strong> is turned on</li></ol><h3>Reset Spell Check in Airmail</h3><ol><li>In Airmail, open a new compose window</li><li>Click on <strong>Edit</strong> in the menu bar</li><li>Go to <strong>Spelling and Grammar</strong></li><li>Make sure <strong>"Check Spelling While Typing"</strong> is checked</li><li>Also check <strong>"Check Grammar With Spelling"</strong> if needed</li></ol><h3>Language Settings</h3><p>If you write in multiple languages, make sure the correct language is selected:</p><ol><li>In the compose window, go to Edit → Spelling and Grammar → Show Spelling and Grammar</li><li>At the bottom of the panel, select the correct language or "Automatic by Language"</li></ol><h3>Still Not Working?</h3><ul><li>Try restarting Airmail</li><li>Reset macOS spell check by deleting ~/Library/Spelling/ folder and restarting</li><li>Update macOS to the latest version</li></ul>

Updated on: 03/28/2026