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.
Webmail Login Security - Security Policy Handling Failed
How to fix the issue of Outlook moving emails to spam folder despite delivery to Inbox on server initially
If you're a cPanel email user using Roundcube or Microsoft Outlook and you've found good emails landing in your Junk folder, you're not alone. This guide will help you understand
Email Filters vs Spam Filters in cPanel