Get 6 months free hosting and free domain name with all 18 month web hosting and email plans.

Troubleshooting Email

How to send email using SMTP and O2 Mobile Broadband



Learn how to troubleshoot email not sending on O2 Mobile Broadband by changing your SMTP settings from port 25 to port 26.


Email does not send if you send an email using O2 Mobile Broadband.

Your email application on your iPhone, Outlook, Windows Mail, Thunderbird, Mail or iPhone or other email client may timeout when sending or return the following error;

SMTP 554 Transact Failed – Transaction failed; Port 25 error; The connection to the server has failed- Error Number: 0×800CCC0E


O2 Mobile Broadband restricts access to SMTP email on port 25.


If you’ve upgraded to Ecenica Hosting Roaming SMTP or subscribe to Ecenica Hosting SMTP for iPhone, you can configure your email application to access your SMTP server on port 26. See How to change SMTP port number.

Changing to port 26 tells your email application to connect to our SMTP servers using a different route and bypasses 02’s restrictions.

If you use your ISP to send email then you’ll need to contact your ISP for assistance. Changing the ports may still work, but you’re best asking them first if they support SMTP over port 26.

Using port 26 but still can’t send?

If you’ve updated to port 26 or are already using port 26 and still can’t send email, please consider the following;

  • Double-check your SMTP settings.
  • Some mail apps require restarting for changes to come into affect.
  • Check your firewall is allowing access over port 26.
  • Many ISP’s limit access to their SMTP to ensure you only use it for home use. If you’re trying to use your ISP’s SMTP service and ask your ISP is they support SMTP over port 26.

My ISP only supports SMTP on port 25. What now?

Why not consider our Roaming SMTP service. Ecenica Roaming SMTP gives you a flexible, dependable and simple SMTP service that you can rely on. Use at home, work or on the move. For a low monthly fee, you can send email from any location, computer or phone – including iPhone. See How can I order Roaming SMTP?

External links

This page is wiki editable click here to edit this page.


Web Hosting – £2.99/mo

Reliable UK web hosting. Free tech support. Trusted UK host since 2004. Free setup. Order online.

cPanel Hosting – £4.99/mo

Fast cPanel hosting with email. Choice of UK/US servers. 30-day money-back promise. Founded 2004.


Related posts:


Tags: , , , , , , , , , , , , , , , , ,

Share this article

If you found this article useful, please feel free to re-tweet. The Url for this post:

Leave a Reply

You must be logged in to post a comment.

Still need help?

Please login to account and submit a new support ticket.


Unless stated, this article is subject to Ecenica Hosting copyright protection. We've worked really hard to bring you this site so before you click copy & paste please take a moment to read our Copyright Notice.

Back to Top