UltraSMTP utilizes SSL and TLS encryption, whenever possible, to secure incoming and outgoing connections.

To ensure that connections from your mail client to UltraSMTP are secure, set your mail client to connect to smtp.ultrasmtp.com on port 465 using SSL.

When delivering mail, UltraSMTP will automatically connect to the remote mail server using Transport Layer Security (TLS) if the remote mail server supports TLS.