Technical data

Table 6–1: POP User Authorization Methods
Method Description
Shared secret password Most secure POP server access method.
Initiated by the client system through the
APOP command.
Allows a user to become authorized by
the POP server without having to send a
password over the network. Eliminates
a potential path for unauthorized users
to obtain a password and break into the
system.
POP requires a shared secret password
from any user who wants to read mail
using the APOP authorization method.
For information about creating the shared
secret password, refer to the Compaq
TCP/IP Services for OpenVMS User’s
Guide.
User name and password Least secure POP server access method.
Initiated by the client system through the
USER and PASS commands.
The POP server authorizes the client to
access the desired mailbox based on receipt
of a valid user name and password.
OpenVMS SYSUAF settings on user
accounts
Access to the POP server is not permitted if:
• Either the DISMAIL or DISUSER f
lags
are set for the account.
• The account has expired according to
the SYSUAF expiration date.
• Access has been denied because of an
incorrect user name and password.
Ability to disable the USER and PASS
commands
Allows the system manager to use the
APOP authorization method for all POP
clients, the more secure means of user
authorization. When you disable the USER
and PASS commands (by defining the
logical name TCPIP$POP_DISUSERPASS),
the POP server responds to the commands
with a failure message.
6.1.5 Understanding POP Message Headers
Mail message headers sent by the POP server must conform to the standard
specified for SMTP in RFC 822. Because many of the messages received on an
OpenVMSsystemarenotinSMTPformat(forexample,DECnetmailormailfrom
another message transport system), the POP server builds a new set of headers for
eachmessagebasedontheOpenVMSmessageheaders.
Table 6–2 describes POP headers on forwarded mail messages.
Table 6–2: Forwarded POP Mail Messages Header
POP Message Header Obtained From
Date:
Arrival date of message. Changed to UNIX
format.
Mail Services 6–3