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SMTP-Auth (SMTP Authentication)
A user certification mechanism in which a sender is certified in sending an e-mail via
SMTP. Unlike POP before SMTP, direct certification is made between an e-mailer and
e-mail server (SMTP server).
SSL (Secure Sockets Layer)
A cryptographic protocol for communications via TCP and UDP. SSL 2.0, SSL 3.0 and
its successor TLS (Transport Layer Security) 1.0 are currently available. The SSL 2.0
is vulnerable. The SSL 3.0 or TLS 1.0 are recommended for secure communications.
Subnet mask
A number to divide an IP address into the network address and the host address. If
the subnet mask is correctly set, normal connection is not established even with the
correct IP address.
URL (Uniform Resource Locator)
A string of characters that refers to a resource (information) on the Internet by its
location. “http://~” and “ftp://~” are URLs.