Knowledge Base

Checking Port 25 Is Not Blocked

If you are unable to send email, you should first verify that all information is correct in your email client. Below are the general email configuration settings.

Refer to the Email Hosting getting started guide for email setup.


Check Your Email Settings

Incoming Server mail.YourDomain.com
Outgoing Server mail.YourDomain.com
Username Your full e-mail address
Password Your e-mail account password
Incoming Port POP3 110 or IMAP 143
Outgoing Mail server (SMTP) Port 587
SMTP Authentication Required
Secure Authentication or SPA Needs to be turned off

Check That Port 25 Is Not Blocked

Some Internet Service Providers (ISPs) may block the normal sendmail port 25, so the easiest way is to contact them and ask for the Outgoing Server SMTP setting which you will then replace (Outgoing Server: mail.yourdomain.com) with the above.

Alternatively if your ISP is blocking port 25 you can try port 465 or 587 instead of 25.

Here is a simple test you can find out if this is the case.


Please note that on newer versions of Windows, Telnet is not enabled automatically. You can turn on Telnet in your computer's Control Panel by clicking on Programs and Features, then clicking on Turn Windows features on or off and ticking the box next to Telnet.

  1. Windows users can access this via start > run > cmd. Mac users can use the Terminal application.
  2. Enter telnet mail.domain.com 25 (replace domain.com with your own domain name).

If you just see a blank screen then your ISP provider is blocking port 25.


If you log in to your Webmail, you will be able to send and receive email from anywhere in the world.

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