Installation manual for Sendmail mail server with authentication in RedHat9.0

Environment: RedHatLinux9.0 full installation or make sure the following installation package has been installed: imap-2001a-18.i286.rpmsendmail-8.12.8-4.i386.rpmm4-1.4.1-13.i386.rpmcyrus-sasl-2.1.10-4.i386.rpmcyrus-sasl-md5-2.1.10-4.i386.rpmcyrus-sasl-Environment: RedHat Linux 9.0 full installation or make sure the following installation package has been installed:
Imap-2001a-18.i286.rpm
Sendmail-8.12.8-4.i386.rpm
M4-1.4.1-13.i386.rpm
Cyrus-sasl-2.1.10-4.i386.rpm
Cyrus-sasl-md5-2.1.10-4.i386.rpm
Cyrus-sasl-plain-2.1.10-4.i386.rpm
Cyrus-sasl-gssapi-2.1.10-4.i386.rpm
Objective: To configure and install an email server with authentication function
　　
1. Sendmail service configuration
1. After installing RedHat Linux 9.0, modify/etc/mail/sendmail. mc. The modified file is as follows:
Divert (-1) dnl
Dnl #
Dnl # This is the sendmail macro config file for m4. If you make changes
Dnl #/etc/mail/sendmail. mc, you will need to regenerate
Dnl #/etc/mail/sendmail. cf file by confirming that the sendmail-cf package is
Dnl # installed and then Ming
Dnl #
Dnl # make-C/etc/mail
Dnl #
Include ('/usr/share/sendmail-cf/m4/cf. m4') dnl
VERSIONID ('setup for Red Hat Linux ') dnl
OSTYPE ('linux ') dnl
Dnl #
Dnl # Uncomment and edit the following line if your outgoing mail needs
Dnl # be sent out through an external mail server:
Dnl #
Dnl define ('smart _ host', 'smtp. your. provider ')
Dnl #
Define ('confdef _ USER_ID ', ''8: 12 '') dnl
Define ('conftrusted _ user', 'smmsp ') dnl
Dnl define ('confauto _ REBUILD ') dnl
Define ('confto _ CONNECT ', '1m') dnl
Define ('conftry _ NULL_MX_LIST ', true) dnl
Define ('confdont _ PROBE_INTERFACES ', true) dnl
Define ('procmail _ MAILER_PATH ','/usr/bin/procmail') dnl
Define ('Alias _ file', '/etc/aliases') dnl
Dnl define ('status _ file', '/etc/mail/statistics') dnl
Define ('ucp _ MAILER_MAX ', '2013') dnl
Define ('confuserdb _ SPEC ','/etc/mail/userdb. db') dnl
Define ('confprivacy _ FLAGS ', 'authwarnings, novrfy, noexpn, restrictqrun') dnl
Define ('confauth _ options', 'A') dnl
Dnl #
Dnl # The following allows relaying if the user authenticates, and disallows
Dnl # plaintext authentication (PLAIN/LOGIN) on non-TLS links
Dnl #
Dnl define ('confauth _ options', 'a p') dnl
Dnl #
Dnl # PLAIN is the preferred plaintext authentication method and used
Dnl # Mozilla Mail and Evolution, though Outlook Express and other MUAs do
Dnl # use LOGIN. Other mechanic ISMs shoshould be used if the connection is not
Dnl # guaranteed secure.
Dnl #