filter
Tests with values blur, brightness, grayscale, hue-rotate, invert, opacity, saturate, sepia and shadow.
Outlook
Windows
2007
2010
2013
2016
2019
Windows Mail
2019-02
macOS
2019-02
16.80
Outlook.com
2019-02
iOS
2019-02
Android
2019-02
Samsung Email
Android
5.0.10.2
Mozilla Thunderbird
macOS
60.8
Fastmail
Desktop Webmail
2021-07
HEY
Desktop Webmail
2020-06
LaPoste.net
Desktop Webmail
2021-08
1&1
Desktop Webmail
2022-06
Android
2022-06
Mail.ru
Desktop Webmail
2024-01
WP.pl
Desktop Webmail
2024-11