Answer:
Port 25 is not open on the firewall
Step-by-step explanation:
Ports can be open or closed on a computer for security reasons. Usually this is done to block public access to processes running on the computer for example by a malicious software.
If an organisation notice they are not getting incoming mail it is most likely due to port 25 being closed in the firewall.
Port 25 controls sending of mails. So it will need to be opened to allow mails to be sent.
The following procedure can be used to open port 25.
- Open control panel
- Right click on Inbound rule. Select New Rule
- Select the port option
- Click on TCP and Local Ports
- Select action to be taken (Allow connection if it is secure).
- Select the type of connection. That is Private or Public
- Assign a name and click Finish