How To Change SMTP Ports For Outbound Email

When creating a new user within your e-mail client, there are times when it is necessary to select a non-standard port number for outbound delivery. Often your connectivity provider/ISP will not have port 25 open so you’ll need to re-route the delivery to a different port number.

easyDNS has quite a few options of other ports to try:

2025, 2026, 465 [SSL], 587, 20025, 20026

The following are popular mail clients and the instruction on how to make the port number adjustment on an established account:

Microsoft Outlook & Outlook Express

  1. In Outlook, drop down the ‘Tools’  menu
  2. Select ‘Accounts or Email Accounts’
  3. View or change existing e-mail accounts should be marked
  4. Click on ‘Next’
  5. Select the account and click on ‘Change’
  6. Select ‘More Settings’
  7. In Outlook Express, drop down the ‘Tools’ menu
  8. Choose ‘Accounts’
  9. Select the account and click on ‘Properties’
  10. Click on the ‘Advanced’ tab
  11. Change the outgoing mail from port 25 to port 2025 or 2026
  12. Make sure that the box that says This connection requires a secure connection(SSL) is NOT checked
  13. Click on ‘OK’
  14. It’s best to restart Outlook

For more assistance in making changes within Outlook, please visit Outlook’s help pages.

Mac Mail

  1. Open Preferences in the Mail menu.
  2. Select the e-mail account to modify under accounts
  3. Beneath Outgoing server (SMTP) click on the drop-down bar and select Edit SMTP server list….
  4. Click on your desired Outgoing server and then click advanced.
  5. Select option for custom port and type in 2025 or 2026.
  6. Click on ‘ok’ and then restart the mail program.


  1. Go to Tools > Account Settings.
  2. Select Outgoing Server (SMTP) on the left pane of the Account Settings window.
  3. Select the SMTP server for your domain here. Click Edit.
  4. Change the number in the Port field to 2525 (if this doesn’t work, follow the same steps, and change the number to 587).
  5. Click OK.
  6. Click OK again to close the Account Settings window.

For more assistance in making changes within Thunderbird, please visit Mozilla’s help pages.