Install PowerMTA

Install the requirments

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

See PowerMTA