Sendmail as a send-only local server

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# cd /usr/share/sendmail/cf/cf
Edit sendmail-slackware.mc :
- Add the line FEATURE(`no_default_msa')dnl to the end of the FEATURE block
- Add the line DAEMON_OPTIONS(`NAME=NoMTA4,Family=inet,Addr=127.0.0.1')dnl right before the MAILER lines
# m4 sendmail-slackware.mc > /etc/mail/sendmail.cf

Add something like

root:           user
user:           user@example.org

to the end of /etc/mail/aliases; then run the command newaliases

# /etc/rc.d/rc.sendmail restart
Make sure that the fqdn-hostname is whitelisted in the inbound smtp server for example.org

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