Free email services like gmail.com, yahoo.com, hotmail.com, etc has no obligation to accept an email should they see unfit, for whatever reason.
As such, when you use Lookafter email service to send emails to free mail services, Lookafter has no guarantee on the email delivery to these free mail services.

We provide limited to no support for communicating with free mail providers.

If your very important business client or partner is using free mail service, please advice them to establish proper business email, as all free mail services are for personal use only (please refer to their Terms and Conditions for more details).