Running spamd as a daemon is denied by blocked socket

I want to run the spamd daemon on bash on an Ubuntu system. When running this command within my virtual machine, I get the following error:

spamd: could not create IO::Socket::IP socket on [::1]:783: Permission denied server socket setup failed, retry 1: spamd: could not create IO::Socket::IP socket on [127.0.0.1]:783: Permission denied

To check what processes are running in the background within bash, I then run this command: ss -tlnp | grep 783 which returns:

Process                                                                                                                                   
LISTEN            0                 4096                              127.0.0.1:783                               0.0.0.0:*                users:(("spamd child",pid=162510,fd=6),("spamd child",pid=162509,fd=6),("spamd",pid=162505,fd=6))                                        
LISTEN            0                 4096                              127.0.0.1:631                               0.0.0.0:*                users:(("cupsd",pid=193524,fd=7))                                                                                                        
LISTEN            0                 4096                                0.0.0.0:22                                0.0.0.0:*                users:(("sshd",pid=155473,fd=3),("systemd",pid=1,fd=218))                                                                                
LISTEN            0                 4096                          127.0.0.53%lo:53                                0.0.0.0:*                users:(("systemd-resolve",pid=568,fd=15))                                                                                                
LISTEN            0                 4096                             127.0.0.54:53                                0.0.0.0:*                users:(("systemd-resolve",pid=568,fd=17))                                                                                                
LISTEN            0                 4096                                  [::1]:783                                  [::]:*                users:(("spamd child",pid=162510,fd=5),("spamd child",pid=162509,fd=5),("spamd",pid=162505,fd=5))                                        
LISTEN            0                 4096                                  [::1]:631                                  [::]:*                users:(("cupsd",pid=193524,fd=6))                                                                                                        
LISTEN            0                 4096                                   [::]:22                                   [::]:*                users:(("sshd",pid=155473,fd=4),("systemd",pid=1,fd=229))                                                                  

Therefore spamd is running as a process in the background. I tried killing it, but that didn't resolve the error, nor did running spamd as a daemon. I was told that the issue is most likely that my virtual machine cannot access some ports.

How do I get the spamd daemon running without confronting this error?

A likely cause is that systemd socket activation is enabled, so starting spamd manually with --daemon is blocked because the socket is already managed by spamd.socket. Check its status with:

systemctl status spamd.socket

If it's active, start only the service:

systemctl start spamd.service

or disable the socket unit if you want spamd to manage its own listener.