You can clone with HTTPS or SSH.
220 mx.google.com ESMTP el2sm5115516ibb.10 EHLO webdev1.int.sentact.com 250-mx.google.com at your service, [207.241.32.58] 250-SIZE 35882577 250-8BITMIME 250-STARTTLS 250 ENHANCEDSTATUSCODES