You can also use the Advik Email Backup Tool and effortlessly backup Webmail emails to PST file. Using this tool you also export emails from your webmail accounts to PST, PDF, CSV, EML and many other file formats. You can also try the demo version of teh software to know more about the backup process.
Steps to Export Emails from Your Webmail to PST
1. Run the Advik Email Backup Wizard.
2. Select your webmail and login.
3. Choose PST from teh different saving options.
4. Enter your Webmail login details and hit the Save button.
Done! Here complete the export process. For more info – https://www.adviksoft.com/blog/export-webmail-to-pst/