DNS Error: failed to get host address info, gai_error 8

If your MacOSX/iOS Swift application gets this error in the Chilkat LastErrorText:

        smtpSocketConnect:
          socket2Connect:
            connect2:
              connectImplicitSsl:
                connectSocket:
                  connect_ipv6_or_ipv4:
                    getAddressInfo:
                      Failed to get host address info. (4)
                      gai_error: 8
                      hostOrIpAddr: smtp.gmail.com
                      port: 465
                    --getAddressInfo
                    getAddressInfo failed.
                  --connect_ipv6_or_ipv4
                --connectSocket
              --connectImplicitSsl
              ConnectFailReason: DNS lookup failed
            --connect2
          --socket2Connect

The solution is to enable the Outgoing Connections option in your Swift project.