Sendmail on Redhat 8

> divert(-1)
> dnl This is the sendmail macro config file. If you make changes to this file,
> dnl you need the sendmail-cf rpm installed and then have to generate a
> dnl new /etc/mail/sendmail.cf by running the following command:
> dnl
> dnl        m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
> dnl
> include(`/usr/share/sendmail-cf/m4/cf.m4')
> VERSIONID(`linux setup for Red Hat Linux')dnl
> OSTYPE(`linux')
> dnl Uncomment and edit the following line if your mail needs to be sent out
> dnl through an external mail server:
> dnl define(`SMART_HOST',`smtp.your.provider')
> define(`confDEF_USER_ID',``8:12'')dnl
> undefine(`UUCP_RELAY')dnl
> undefine(`BITNET_RELAY')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(`UUCP_MAILER_MAX', `2000000')dnl
> define(`confUSERDB_SPEC', `/etc/mail/userdb.db')dnl
> define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl
> define(`confAUTH_OPTIONS', `A')dnl
> dnl TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
> dnl define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLA
> IN')dnl
> dnl define(`confCACERT_PATH',`/usr/share/ssl/certs')
> dnl define(`confCACERT',`/usr/share/ssl/certs/ca-bundle.crt')
> dnl define(`confSERVER_CERT',`/usr/share/ssl/certs/sendmail.pem')
> dnl define(`confSERVER_KEY',`/usr/share/ssl/certs/sendmail.pem')
> dnl define(`confTO_QUEUEWARN', `4h')dnl
> dnl define(`confTO_QUEUERETURN', `5d')dnl
> dnl define(`confQUEUE_LA', `12')dnl
> dnl define(`confREFUSE_LA', `18')dnl
> define(`confTO_IDENT', `0')dnl
> dnl FEATURE(delay_checks)dnl
> FEATURE(`no_default_msa',`dnl')dnl
> FEATURE(`smrsh',`/usr/sbin/smrsh')dnl
> FEATURE(`mailertable',`hash -o /etc/mail/mailertable.db')dnl
> FEATURE(`virtusertable',`hash -o /etc/mail/virtusertable.db')dnl
> FEATURE(redirect)dnl
> FEATURE(always_add_domain)dnl
> FEATURE(use_cw_file)dnl
> FEATURE(use_ct_file)dnl
> dnl The '-t' option will retry delivery if e.g. the user runs over his quota.
> FEATURE(local_procmail,`',`procmail -t -Y -a $h -d $u')dnl
> FEATURE(`access_db',`hash -T<TMPF> -o /etc/mail/access.db')dnl
> FEATURE(`blacklist_recipients')dnl
> EXPOSED_USER(`root')dnl
> dnl This changes sendmail to only listen on the loopback device 127.0.0.1
> dnl and not on any other network devices. Comment this out if you want
> dnl to accept email over the network.
> dnl # DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')
> dnl NOTE: binding both IPv4 and IPv6 daemon to the same port requires
> dnl       a kernel patch
> dnl DAEMON_OPTIONS(`port=smtp,Addr=::1, Name=MTA-v6, Family=inet6')
> dnl We strongly recommend to comment this one out if you want to protect
> dnl yourself from spam. However, the laptop and users on computers that do
> dnl not have 24x7 DNS do need this.
> FEATURE(`accept_unresolvable_domains')dnl
> dnl FEATURE(`relay_based_on_MX')dnl
> MAILER(smtp)dnl
> MAILER(procmail)dnl
> Cwlocalhost.localdomain