Fixing Sendmail

If Sendmail is not behaving as expected or hangs during installation, it might be because FQDN is not set.

Perform the following steps:

1. Set an FQDN for your Photon OS machine.

2. Run the following commands in the order below:

   echo $(hostname -f) > /etc/mail/local-host-names
   
       cat > /etc/mail/aliases << "EOF"
           postmaster: root
           MAILER-DAEMON: root
           EOF
   
       /bin/newaliases
   
       cd /etc/mail
   
       m4 m4/cf.m4 sendmail.mc > sendmail.cf
   
       chmod 700 /var/spool/clientmqueue
   
       chown smmsp:smmsp /var/spool/clientmqueue