If you are still experiencing email compatibility issues despite proper email client settings, you may need to have your SMTP IP whitelisted. This process involves providing your VPN support team with the necessary information, including email address(es), SMTP/outgoing email server name, port number, and SSL setting. They may also require screenshots of your email provider’s settings. After verifying that the server does not allow spam traffic, your SMTP IP can be added to the whitelist. This process may take some time to propagate across all VPN servers.