Install the requirements
yum install unzip net-tools telnet git gdb -y
If you already have a mail server remove it.
yum remove postfix -y
If you want to keep current mail server, you can run PowerMTA on a port other than 25.
cd /root/PMTA/ unzip PowerMTA5.0r1.zip cd /root/PMTA/PowerMTA5.0r1 yum install PowerMTA-5.0r1-201909161531.x86_64.rpm service pmta stop service pmtahttp stop rm -f /usr/sbin/pmtad rm -f /usr/sbin/pmtahttpd cd /root/PMTA/PowerMTA5.0r1/usr/sbin cp * /usr/sbin chmod -R 755 /usr/sbin/pmta chmod -R 755 /usr/sbin/pmtad chmod -R 755 /usr/sbin/pmtahttpd cp /root/PMTA/PowerMTA5.0r1/license /etc/pmta
Restart PowerMTA
service pmta start service pmtahttp start
If you get any error, run powermta in debug mode
pmtad --debug
To customoize your PowerMTA install, edit config file
vi /etc/pmta/config
After editing config file, you need to restart PowerMTA
service pmta restart
Or reload, which is faster
service pmta reload