setting up gmail in outlook 2016 server certificate error

Select the Email system to which your server belongs.Click on the Use your own mail server radio button.In the Email settings page, enter the custom email address of the mailbox you want to use in the 'Your support email' text box.Click on the Edit button next to the mailbox for which you want to use a custom server or you can create a new mailbox by clicking on the New support email button.Log in to your Freshdesk account as an administrator.

When you set up a custom mailbox, the last day's emails in the mailbox (both read and unread emails) from the Inbox will be fetched and created as tickets. Besides that, you can choose to configure with public servers like Gmail or your private servers. You can use your custom mail server only for incoming or outgoing or both. This functionality lets you make sure that all your email transactions are outside Freshdesk, and will be completely managed at your end. In addition to setting up your support mailbox via email forwarding, you can also choose to use your own email servers for sending and receiving emails through Freshdesk.

Setting up gmail in outlook 2016 server certificate error