I've bought an unmanaged dedicated server. Mainly to help me learn.
My email isn't working and the host support have told me I that need to open port 25 to enable smtp. Note I can't send or receive email.
I've used SSH to login and I've tried a few of the sample snippets of code from this forum but I just get a command not found back.
My server is running centOS and it has a Plesk GUI.
I've connected to the server using ssh root@myipaddress
The command to check if 25 is open:
Telnet <your-IP> 25
If it allows it, the port is open and that's not your problem.
If connection is refused, do the following:
sudo vi /etc/iptables.test.rules
Check that there is an entry like this:
# Allows SMTP access -A INPUT -p tcp --dport 25 -j ACCEPT
If not, change it using vi commands. If you're new, remember i goes into insert mode to use standard keyboard and :wq! saves when you're done.
Next, apply the rules you just wrote.
sudo iptables-restore < /etc/iptables.test.rules
Check to make sure the rules are applied correctly.
sudo iptables -L
Next, save them permanently.
sudo iptables-save > /etc/iptables.up.rules
netstat -a | grep 25 This will look for all ports then filter out just the lines that include "25" nc -l 25 then from a remote computer either ssh to port 25 or nc <local $hostname> 25
telnet your_ip_address 25and update your original post with the output you see on the terminal window.netstat -an | grep 25this will show you if anything is listening on the smtp port, i.e. port 25, on your server. If it is not, this means you can not receive email on this server.