First off, I want to thank you for your patience with the email issue affecting some mail configurations. We know these kinds of issues are major inconveniences and have been working diligently to solve this issue.
It took us a while to track this down, but we’ve been able to determine the problem exists with the following mail clients and operating system combinations:
- Microsoft Outlook on Windows 7
- Pegasus Mail on Windows 7
Mozilla Thunderbird on Windows 7 appears to be unaffected and works correctly, as does any mail client on Windows 10.
The “fix” for this suggested by Microsoft and cPanel is to downgrade to SSLv3 security. To do this would put our customers data at risk and thus we aren’t willing to do this. Security trumps everything else, so the following workarounds are available.
Ensure Windows 7 and Outlook Are Fully Updated
If you have a computer running Windows 7 or Office, please ensure that both are fully up to date. If you’re using an older version of Outlook (2013 or earlier), you will want to upgrade. Office 2013 becomes unsupported as of April 2018 by Microsoft, and any version before that has long been out of date.
Once you’ve ensured Windows 7 and Office are fully up to date, if that doesn’t resolve the problem, you may try this fix from Microsoft. This patch is a recommended update, but you may have skipped it in Windows Update or it may have failed to install.
There are reports of this patch fixing issues with non-Microsoft mail clients.
Upgrade to Windows 10
Modern versions of Windows have the modern SSL support required to address this issue. Windows 7 supposedly does as well, but we have found systems that lack proper modern TLS support. This is likely due to a stuck or non-applied Windows update.
Use Mozilla Thunderbird
Mozilla Thunderbird appears unaffected by this issue and is fully supported. Many prefer it for its speed and simplicity. It’s open source and free.
We realize this isn’t an ideal solution for all clients, but this will always work on any computer. It’s flexible, fast, and extremely reliable. You can access webmail by going to http://yourdomain/webmail or http://mail.yourodmain.com/webmail.
If you have any questions, please let us know. We’re always here to help!