Passing a userid and password in an e-mail presents a possible security exposure. While the e-mail resides on the POP3 or IMAP server, someone might be able to access the information in the e-mail using the userid and password. To make your communication with the e-mail server secure, you can configure Integration Server to use either explicit or implicit Transport Layer Security (TLS) through Secure Sockets Layer (SSL). Integration Server uses client certificates for implementing Transport Layer Security and authenticates the connection using the userid and password.