Changing SMTP default port

1- Check which there is an unsigned port 

2- Edit /etc/services file

3- Comment lines with smtp
#smtp                   25/tcp          # Simple Mail Transfer
#smtp                   25/udp          # Simple Mail Transfer

4- Add lines with new port and save the /etc/service file
smtp                   1025/tcp          # Simple Mail Transfer

smtp                   1025/udp          # Simple Mail Transfer

5- Restart sendmail service
#refresh -s sendmail

Reference: http://www.aixmind.com/?p=1413

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