Install SpamAssassin on CentOS/RHEL/Oracle Linux

sudo dnf install spamassassin
The binary installed by the spamassassin package is called spamd, which will be listening on TCP port 783 on the local host.

By default, the spamassassin systemd service is disabled, you can enable auto start at boot time with:

sudo systemctl enable spamassassin

Then start SpamAssassin.

sudo systemctl start spamassassin


[ec2-user@ip-172-31-5-206 ~]$ sudo ss -ant | grep 783
LISTEN   0         128               127.0.0.1:783              0.0.0.0:*
LISTEN   0         128                   [::1]:783                 [::]:*
[ec2-user@ip-172-31-5-206 ~]$ sudo -i lsof -i TCP:783
COMMAND    PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
/usr/bin/ 7556 root    5u  IPv4  44647      0t0  TCP localhost:783 (LISTEN)
/usr/bin/ 7556 root    6u  IPv6  44649      0t0  TCP localhost6:783 (LISTEN)
spamd     7558 root    5u  IPv4  44647      0t0  TCP localhost:783 (LISTEN)
spamd     7558 root    6u  IPv6  44649      0t0  TCP localhost6:783 (LISTEN)
spamd     7559 root    5u  IPv4  44647      0t0  TCP localhost:783 (LISTEN)
spamd     7559 root    6u  IPv6  44649      0t0  TCP localhost6:783 (LISTEN)

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