How to Change Your SMTP Port to Allow Sending Email
If you can't send email while you're away from home, and you're a guest on another network, that ISP may be blocking SMTP port 25. This port is standard for sending email. But it's also standard for sending spam, so ISPs often block it.
In order to send email again, you'll have to change to a different port number. Please use port 587.
Here's how to change the port number in your favorite email client. Instructions below are for Microsoft Outlook.
- Open Tools > Account Settings.
- Select the appropriate email account from the list. Click Change.
- Click More Settings.
- Check the "My outgoing server (SMTP) requires authentication" box.
- Make sure that "Use same settings as my incoming mail server" is selected.
- Click the Advanced tab.
- Change the Outgoing Server field number from 25 to 587.
- Click OK.
- Click Next until you reach the Finish button. Click Finish.