From August 17th, 2021 we will no longer support the TLS versions 1.0 and 1.1 for email. This might cause issues with receiving and sending emails if you are using a mail client with an older operating system on your device. This guide explains how to find out which TLS version you are using and how to solve issues related to the discontinuation of the older TLS versions.
Note: You will always be able to send and receive emails via our one.com Webmail.
- How do I know if I am affected by the change?
- How can I check which TLS version I am using?
- Update your mail client and operating system
- Use Webmail or another browser-based email solution
- Disable encryption in your IMAP settings
Tip: For general information about the discontinuation of TLS 1.0/1.1, check out our guide: Why does one.com stop support for TLS 1.0/1.1?
How do I know if I will be affected by the change?
If you are using an older operating system on your device and if you experience any issues with sending or receiving emails after August 17, 2021, you might be affected by the discontinuation of TLS 1.0 and 1.1.
You might also get an error message in your mail client. It could say something similar to this:
0x800CCC1A. 'Your server does not support the connection encryption type you have specified. Try changing the encryption method. Contact your mail server administrator or Internet service provider (ISP) for additional assistance.'
If you are affected by the change, you have three options to solve this:
- Update your email client and operating system.
- Use one.com Webmail instead of a mail client.
- Disable encryption in your IMAP settings.
How can I check which TLS version I am using?
You can check which TLS version you are using in a few simple steps:
- Log in to your email client (for example Outlook, Apple Mail, Thunderbird).
- Send an email to the following email address: firstname.lastname@example.org
- You will receive an automatic response, telling you which TLS version you are currently using. The TLS version will be shown in the line "protocol".
The protocol shows 1.2 or 1.3
This means you are using a current TLS version. Everything is good and you don't need to do anything.
The protocol shows 1.0 or 1.1
This means that your mail client is using an old TLS version and you might not be able to send and receive emails after August 17th, 2021. Please look at the sections below to find solutions.
Update your mail client and operating system
The best way to solve the issue would be by updating your mail client and your operating system. We recommend checking if there are any updates for your mail client or your operating system available. In general, it is recommended to update your operating system regularly to make sure that everything works smoothly and that security options are up to date. Older operating systems are more vulnerable to cyber-attacks.
Windows updates (desktop computer or laptop)
To find out if there are any updates for your Windows operating system available, please follow these steps:
- Click on the Start button (Windows icon) in the bottom left corner of your screen.
- Open the Settings by clicking on the gear icon.
- Select Update & Security. You will now be able to see if there are any updates for your Windows operating system available.
Android updates (tablet and phone)
To find out if there are any updates for your Android operating system available, please follow these steps:
- Open the Settings on your mobile device.
- Tap System and select Advanced.
- Select System update. You will now see which Android version your device is currently using and if there are any updates available.
macOS updates (desktop and MacBook)
To find out if there are any updates for your Apple operating system available, please follow these steps:
- Open the menu (Apple icon) in the corner of your screen.
- Select System Preferences.
- Click Software Update. You will now see whether there is an update or an upgrade of your operating system available.
iOS updates (iPhone and iPad)
To find out if there are any updates for your iOS available, please follow these steps:
- Go to Settings on your mobile device.
- Select General.
- Select Software Update. You will now see which iOS version currently is installed on your device and whether there are any updates available.
Use Webmail or another browser-based email solution
We always keep our one.com Webmail up to date with the latest security standards. This means that Webmail will not be affected by the discontinuation of TLS 1.0 and 1.1., and will continue working as usual.
Therefore, you will always be able to access your mail account and send and receive emails via our one.com Webmail, even if you experience any issues with your mail client (for example Outlook, Thunderbird or Apple Mail).
You can also use other browser-based email solutions, such as Gmail.
If you haven't used Webmail before, check the guides below:
Disable encryption in your IMAP settings
If there is no update for your operating system or mail client available, and you cannot send or receive emails anymore, you can change the settings for your mail servers in the mail client not to use any encryption.
Note: When you disable encryption, the content of your emails is not secure and everyone could intercept and read them. We recommend using one of the other options.
Change the mail server settings in your mail client to the following settings:
Incoming mail (IMAP):
- Incoming server: imap.one.com
- Port: 143
- Encryption: None
Outgoing mail (SMTP):
- Outgoing server: send.one.com
- Port: 25 or 2525
- Encryption: None
- Verification: username and password, same as the incoming server
We recommend using IMAP, but if you prefer using POP, you can use the following settings for the incoming server:
- Incoming server: pop.one.com
- Port: 110
- Encryption: None