We tested these email clients using internal test tools and Litmus.

Fully supported

All the options work properly. Fallback elements show for image backgrounds and web fonts.

Desktop
Apple Mail 8, 9 & 10
Thunderbird
Airmail2
Microsoft Outlook for Mac 2011, 2016
Microsoft Outlook for Windows 2007, 2010, 2011, 2013, 2016 *

* Background images and web fonts are not supported

 Mobile

Android 4.4 Mail
Gmail App (iOS)
Gmail App (Android)*
iOS Mail (iPhone & iPad)
Outlook App (Android & iOS)**
Samsung Mail App (Android)
Yahoo App (Android & iOS)

* When using a Gmail account

** Will show the desktop version when using Microsoft email accounts

 Web

Gmail

G Suite
Inbox by Gmail
Outlook.com
Office 365
Yahoo
AOL Mail
Comcast
freenet.de
GMX.de (web version)
Mail.ru
Libero Mail
Tiscali
Virgilio
email.it
Web.de (web version)
Centrum.cz
Seznam.cz, Post.cz, Email.cz

Note: none of the above services supports web fonts

 

Partial support for some options

Messages display correctly, but some options (with low impact) may not display as expected.

Desktop

Microsoft Outlook 2013 in high-resolution displays *
Microsoft Outlook 2016 in high-resolution displays **
Microsoft Outlook 2000, 2002 & 2003 ***

* Background images and web fonts are not supported. Applies a font resize that may expand the layout.

** Background images and web fonts are not supported. Applies a font resize that may expand the layout. The text is scaled at 200% by default in some devices.

*** Web fonts are not supported. Buttons don't display round corners. Social icons are not flexible.

Mobile

Huawei Mail App (Android) *

* Icons in social content block appear vertically stacked (tested on app version 3.1.0.27)

Web

qq.com *
Yandex.ru

* Buttons doesn't display properly.

Not yet supported

This list includes new and updated mobile email clients with compatibility issues.

Huawei Mail App (Android)

Only basic settings works

When sending to this clients, we recommend using text and images in a simple one-column layout.

Desktop

Lotus Notes 7, 8 & 8.5
Windows 10 Mail
IBM Notes 9

Mobile

Gmail App using IMAP accounts
Web clients (mobile versions)

Web

T-online.de

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