When using an external SMTP client such as Outlook to send an email, the sent mail is not saved into the account's "Sent" folder. They will not show up when looking at Webmail or through a different device.
Beginning in version 114 of cPanel, you can enable Two Factor Authentication from within the webmail interface of an email account in cPanel.
Webmail Login Security - Security Policy Handling Failed
Resolving the "552.5.3.4 Your Message Exceeded Google's Message Size Limits" Error
