In Windows XP, we can manually open port 25 for pop3 for retrieving email and port 110 for smtp server or sending email. But, some ISP blocked port 25 and port 110 as a security measure and other reasons.
However, we may open the port 25 and port 110 manually if required. By default, most 3rd party software such as Microsoft Outlook or Outlook Express, has already open port 25 and port 110.

To check whether the port is open or closed, follow the instructions below:
1. Goto Start,Run.
2. type; telnet youremailserver 25
3. It should show Connecting to youremailserver...
4. If its connected, it will show +OK pop300 bla bla bla .......
5. If not the conection is failed...

To manually open the port:
1. Goto Start,Control Panel.
2. Open Windows Firewall.
3. Click Exceptions Tabs.
4. Click Add Port.
5. At Name Column, Type the name of your email server.
6. At Port Column, Type number 25.
7. Click Apply, Ok, then exit...

Please take note for Malaysian Tmnet Broadband Streamyx users, port 25 was blocked by ISP - TMNet Berhad. For more info, please click here to read article posted.

Now the port is open... Good Luck

4 comments

  1. Galethegreat // April 4, 2011 at 7:00 AM

    ok so what is my mail server???? I am very new to this and I do not know what my mail server is. I use yahoo mail and thats it.

  2. Ayub // April 5, 2011 at 5:20 AM

    your mailserver name is provided by your ISP.

  3. TEj@$ // June 4, 2011 at 12:16 PM

    Hey Ty for such simple explaination but still was not able to open port 25 on my pc.....help

  4. Anonymous // August 9, 2011 at 12:03 PM

    i have a router too then what i have to do ....i give exception for port25 but is still blocked