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Mail Server Security Update (March – May 2019)




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Through March to May 2019, we will be upgrading our customer servers to use only modern security methods. This upgrade will result in disabling the TLS v1.0 protocol.

What is TLS v1.0?

TLS stands for Transport Layer Security. It's the security protocol most often used on websites, applications, and email. Whenever you get on the internet, it is likely that you use some version of TLS.

What's the difference between SSL and TLS?

In order to understand the relationship between SSL and TLS, we must first talk about their timeline.

In 1994, SSL was created. SSL was a security protocol meant to encrypt internet connections. Over time, SSL evolved into TLS. TLS protocols have the same purpose: to encrypt internet connections. So TLS is just an updated, more secure version of SSL.

Because of its close relationship with its predecessor, TLS is often still referred to as "SSL."

For example, SSL certificates actually use TLS protocols.  

So, if TLS is a better version of SSL, why are we disabling it?

We're not disabling all TLS protocols - only TLS v1.0. TLS v1.0 was released in January 1999, so the protocol is almost twenty years old. The PCI Council, the security standard council for card payments, has also declared that TLS v.1.0 is no longer secure. Because of these factors, it is necessary to disable TLS v1.0 to keep your mail servers secure.

What does this change mean for my server? Is there any software that will no longer work?

Most software or mail clients are unlikely to show any noticeable difference.

However, some software may not be compatible with the changes. You may run into connectivity issues if you have any of the following mail client software installed on your local machine:

  • Outlook 2010 and older
  • Windows 7 and older
  • Apple Mail 9.3 and older
  • Mac OS 10.11 (El Capitan) and older
  • OEClassic
  • Eudora
  • Microsoft Entourage
  • Outlook for Mac 2012 and older
  • Thunderbird 27 and older
  • Windows Live Mail
  • Mail clients on iPhone 4

I am running an incompatible software program. What should I do?

If you are running any of the software listed above, contact us as soon as possible to discuss other software options.

This update happened and now I can't connect

If you cannot connect, contact our support team. Some software is incompatible without the use of TLS v1.0. A list of known incompatible software is listed above.

If you suspect that your mail server is running incompatible software, contact our support team. They will be able to identify if the software is incompatible and suggest possible fixes or compatible software replacements.

Updated on May 7, 2019

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