Hi Zimbra Customers, Partners & Friends, Do you want to prevent man-in-the-middle attacks and enhance your email confidentiality? You can with MTA-STS. MTA-STS is short for Mail Transfer Agent (MTA) Strict Transport Security (STS). MTA-STS enforces encryption and secure communications between SMTP servers via TLS (Transport Layer Security). With MTA-STS fully implemented, it prevents man-in-the-middle […]