Enable SMTP Port 587 on Exim

Most of the ISP block port 25 for outgoing SMTP. To enable Port 587 on exim, add this configuration to Exim’s configuration file.

daemon_smtp_ports = 25 : 587

Alternatively, with latest exim configuration file, uncomment the line below and you might want to remove 465.

# daemon_smtp_ports = 25 : 465 : 587

After that, save your configuration and restart exim service.

Test on Port 587

After exim service has restarted, make a telnet test to port 587

shell> telnet localhost 587

Connected? If yes, it means Exim on SMTP Port 587 is enabled now.