So busy setting up new SharePoint 2016 environment and needed to configure the incoming e-mail settings but I can only see the link in Central Admin for the outgoing e-mails.

Seems there are some strange security issues with Central Administration which prevents some links from displaying (even if you login as the Farm administrator.

Fixes:

Open Internet Explorer as Administrator (that’s it)

Or, use Central Administration via the Start menu on the SharePoint server (the shortcut forces the elevated privileges)