Checking your outgoing mail server (Is Port 25 blocked?)
Many email clients and services use port 25 for SMTP to send out emails. However an ISP (Internet Service Provider) may block port 25 in order to prevent spamming by its customers. Here is how you can check to see if port 25 is blocked on your network.
1. Type the following command:
telnet serverbuddies.com 25
2. View Results:
If port 25 is not blocked you will get a successful 220 response (text may vary).
telnet serverbuddies.com 25
Trying 67.228.43.85…
Connected to serverbuddies.com.
Escape character is ‘^]’.
220-box.serverbuddies.com ESMTP Exim 4.69 #1 Mon, 07 Jun 2010 02:23:15 -0500
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
Connected to serverbuddies.com.
Escape character is ‘^]’.
220-box.serverbuddies.com ESMTP Exim 4.69 #1 Mon, 07 Jun 2010 02:23:15 -0500
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
If port 25 is blocked you will get a connection error or no response at all.
Trying 67.228.43.85…
telnet: connect to address 67.228.43.85: Connection refused
telnet: Unable to connect to remote host
telnet: connect to address 67.228.43.85: Connection refused
telnet: Unable to connect to remote host
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