Cannot Send Mail - Authentication Error

<h2>Problem</h2><p>The user receives an error message: "Cannot send mail. Unable to authenticate with the current session's credentials."</p><h2>Solution</h2><p>This error typically indicates that the email account's authentication token has expired or become invalid. To resolve:</p><ul><li><strong>For Gmail accounts:</strong> Go to Airmail Settings → Accounts → double-click on the Gmail account → User → Refresh Token.</li><li><strong>For IMAP/POP accounts:</strong> Go to Airmail Settings → Accounts → re-enter the password in both the IMAP and SMTP fields.</li><li><strong>For Outlook/Exchange:</strong> Create a new app-specific password via the Outlook web login and update it in Airmail.</li></ul><p>After updating credentials, restart the Airmail app and try sending again.</p>

Updated on: 03/28/2026