Email Client Feature Support Rankings

Email Client Feature Support Rankings

Last modified:

Can I Email? breaks down email features by the clients that support them. These features come with intrinsic value, which can be broken up into three buckets. Accessibility, performance, and internationalization (i18n).

This page lists the number of features supported in each category by each email client.

Email client ranks by category

The below outlines the three categories of accessibility, performance, and internationalization with the respective email clients that support them.

Accessibility (37 tested features)

These features are key to enabling assistive technology such as screen readers to be able to ingest email content. Email clients that support a majority of these features give email creators all opportunities to create accessible emails for their subscribers.

Tested features
Number of features Email Clients
34/37
  • Apple Mail (MacOS)
31/37
  • Apple Mail (iOS)
  • Samsung Email (Android)
29/37
  • ProtonMail (Desktop webmail)
  • ProtonMail (iOS)
26/37
  • ProtonMail (Android)
25/37
  • Outlook (Android)
  • Mozilla Thunderbird (MacOS)
23/37
  • SFR (Desktop webmail)
  • GMX (iOS)
22/37
  • Outlook (MacOS)
  • Outlook (iOS)
  • SFR (iOS)
21/37
  • SFR (Android)
  • WEB.DE (iOS)
20/37
  • Outlook (outlook.com)
  • Fastmail (Desktop webmail)
19/37
  • LaPoste.net (Desktop webmail)
17/37
  • Gmail (Desktop webmail)
  • AOL (Android)
16/37
  • Yahoo! Mail (Desktop webmail)
  • Yahoo! Mail (Android)
  • AOL (Desktop webmail)
  • Mail.ru (Desktop webmail)
  • 1&1 (Desktop webmail)
15/37
  • Gmail (iOS)
  • Gmail (Android)
  • Gmail (Mobile webmail)
14/37
  • Yahoo! Mail (iOS)
12/37
  • AOL (iOS)
  • GMX (Android)
11/37
  • Outlook (Windows)
  • Orange (Desktop webmail)
  • Orange (Android)
  • HEY (Desktop webmail)
10/37
  • Orange (iOS)
  • GMX (Desktop webmail)
  • WEB.DE (Android)
  • 1&1 (Android)
9/37
  • WEB.DE (Desktop webmail)
8/37
  • Outlook (Windows mail)
4/37
  • Free.fr (Desktop webmail)
2/37
  • T-online.de (Desktop webmail)
0/37
  • Mozilla Thunderbird (Windows)

Performance (6 tested features)

These features are key to the success of email rendering and loading.

Tested features
Number of features Email Clients
6/6
  • Apple Mail (iOS)
  • Samsung Email (Android)
  • SFR (Desktop webmail)
5/6
  • Apple Mail (MacOS)
  • LaPoste.net (Desktop webmail)
4/6
  • Outlook (MacOS)
  • Outlook (outlook.com)
  • Outlook (iOS)
  • Outlook (Android)
  • Mozilla Thunderbird (MacOS)
  • SFR (iOS)
  • SFR (Android)
  • Orange (Desktop webmail)
  • HEY (Desktop webmail)
  • GMX (iOS)
  • WEB.DE (iOS)
3/6
  • Yahoo! Mail (Desktop webmail)
  • Yahoo! Mail (iOS)
  • Yahoo! Mail (Android)
  • AOL (Desktop webmail)
  • AOL (iOS)
  • AOL (Android)
  • Orange (iOS)
  • Orange (Android)
  • ProtonMail (Desktop webmail)
  • ProtonMail (iOS)
2/6
  • Outlook (Windows mail)
  • ProtonMail (Android)
  • Mail.ru (Desktop webmail)
  • Fastmail (Desktop webmail)
  • GMX (Android)
  • WEB.DE (Android)
  • 1&1 (Desktop webmail)
  • 1&1 (Android)
1/6
  • Gmail (Desktop webmail)
  • Gmail (iOS)
  • Gmail (Android)
  • Gmail (Mobile webmail)
  • Outlook (Windows)
  • Mozilla Thunderbird (Windows)
  • Free.fr (Desktop webmail)
  • GMX (Desktop webmail)
  • WEB.DE (Desktop webmail)
0/6
  • T-online.de (Desktop webmail)

Internationalization (39 tested features)

Certain aspects of HTML and CSS are limited in their ability to translate across many languages. This category of features outlines those that are beneficial to internationalization (I18n) which would allow for developers the freedom to create semantic HTML in languages aside from English.

Tested features
Number of features Email Clients
38/39
  • ProtonMail (Android)
37/39
  • Apple Mail (MacOS)
  • Apple Mail (iOS)
  • ProtonMail (Desktop webmail)
  • ProtonMail (iOS)
33/39
  • Mail.ru (Desktop webmail)
30/39
  • Samsung Email (Android)
26/39
  • GMX (iOS)
  • WEB.DE (iOS)
22/39
  • Mozilla Thunderbird (MacOS)
  • SFR (Desktop webmail)
  • GMX (Android)
  • WEB.DE (Android)
  • 1&1 (Desktop webmail)
  • 1&1 (Android)
20/39
  • SFR (iOS)
19/39
  • SFR (Android)
18/39
  • Outlook (iOS)
  • LaPoste.net (Desktop webmail)
16/39
  • Outlook (outlook.com)
  • Fastmail (Desktop webmail)
15/39
  • Outlook (MacOS)
  • Outlook (Android)
13/39
  • Gmail (Desktop webmail)
  • HEY (Desktop webmail)
10/39
  • Gmail (iOS)
  • AOL (iOS)
9/39
  • Gmail (Android)
  • Gmail (Mobile webmail)
  • Yahoo! Mail (Desktop webmail)
  • Yahoo! Mail (iOS)
  • Yahoo! Mail (Android)
  • AOL (Desktop webmail)
  • AOL (Android)
8/39
  • Orange (iOS)
  • Orange (Android)
6/39
  • Orange (Desktop webmail)
4/39
  • GMX (Desktop webmail)
  • WEB.DE (Desktop webmail)
3/39
  • Outlook (Windows)
  • Outlook (Windows mail)
1/39
  • T-online.de (Desktop webmail)
  • Free.fr (Desktop webmail)
0/39
  • Mozilla Thunderbird (Windows)

Features per email client

Gmail (Desktop webmail)

Category Supported Partial Unsupported Untested Total
Accessibility 17(view) 2(view) 18(view) 0 37
Internationalization 13(view) 1(view) 25(view) 0 39
Performance 1(view) 2(view) 3(view) 0 6

Gmail (iOS)

Category Supported Partial Unsupported Untested Total
Accessibility 15(view) 4(view) 18(view) 0 37
Internationalization 10(view) 4(view) 25(view) 0 39
Performance 1(view) 2(view) 3(view) 0 6

Gmail (Android)

Category Supported Partial Unsupported Untested Total
Accessibility 15(view) 6(view) 16(view) 0 37
Internationalization 9(view) 7(view) 23(view) 0 39
Performance 1(view) 2(view) 3(view) 0 6

Gmail (Mobile webmail)

Category Supported Partial Unsupported Untested Total
Accessibility 15(view) 3(view) 19(view) 0 37
Internationalization 9(view) 4(view) 25(view) 1(view) 39
Performance 1(view) 2(view) 3(view) 0 6

Outlook (Windows)

Category Supported Partial Unsupported Untested Total
Accessibility 11(view) 4(view) 21(view) 1(view) 37
Internationalization 3(view) 5(view) 31(view) 0 39
Performance 1(view) 0 5(view) 0 6

Outlook (Windows mail)

Category Supported Partial Unsupported Untested Total
Accessibility 8(view) 3(view) 22(view) 4(view) 37
Internationalization 3(view) 5(view) 30(view) 1(view) 39
Performance 2(view) 0 4(view) 0 6

Outlook (MacOS)

Category Supported Partial Unsupported Untested Total
Accessibility 22(view) 7(view) 8(view) 0 37
Internationalization 15(view) 1(view) 23(view) 0 39
Performance 4(view) 0 2(view) 0 6

Outlook (outlook.com)

Category Supported Partial Unsupported Untested Total
Accessibility 20(view) 7(view) 10(view) 0 37
Internationalization 16(view) 0 23(view) 0 39
Performance 4(view) 0 2(view) 0 6

Outlook (iOS)

Category Supported Partial Unsupported Untested Total
Accessibility 22(view) 2(view) 11(view) 2(view) 37
Internationalization 18(view) 1(view) 20(view) 0 39
Performance 4(view) 0 2(view) 0 6

Outlook (Android)

Category Supported Partial Unsupported Untested Total
Accessibility 25(view) 4(view) 7(view) 1(view) 37
Internationalization 15(view) 1(view) 23(view) 0 39
Performance 4(view) 0 2(view) 0 6

Yahoo! Mail (Desktop webmail)

Category Supported Partial Unsupported Untested Total
Accessibility 16(view) 5(view) 16(view) 0 37
Internationalization 9(view) 3(view) 27(view) 0 39
Performance 3(view) 0 3(view) 0 6

Yahoo! Mail (iOS)

Category Supported Partial Unsupported Untested Total
Accessibility 14(view) 4(view) 17(view) 2(view) 37
Internationalization 9(view) 3(view) 27(view) 0 39
Performance 3(view) 0 3(view) 0 6

Yahoo! Mail (Android)

Category Supported Partial Unsupported Untested Total
Accessibility 16(view) 5(view) 15(view) 1(view) 37
Internationalization 9(view) 3(view) 27(view) 0 39
Performance 3(view) 0 3(view) 0 6

Apple Mail (MacOS)

Category Supported Partial Unsupported Untested Total
Accessibility 34(view) 3(view) 0 0 37
Internationalization 37(view) 1(view) 1(view) 0 39
Performance 5(view) 1(view) 0 0 6

Apple Mail (iOS)

Category Supported Partial Unsupported Untested Total
Accessibility 31(view) 0 4(view) 2(view) 37
Internationalization 37(view) 1(view) 1(view) 0 39
Performance 6(view) 0 0 0 6

AOL (Desktop webmail)

Category Supported Partial Unsupported Untested Total
Accessibility 16(view) 3(view) 16(view) 2(view) 37
Internationalization 9(view) 3(view) 27(view) 0 39
Performance 3(view) 0 3(view) 0 6

AOL (iOS)

Category Supported Partial Unsupported Untested Total
Accessibility 12(view) 2(view) 18(view) 5(view) 37
Internationalization 10(view) 2(view) 24(view) 3(view) 39
Performance 3(view) 0 3(view) 0 6

AOL (Android)

Category Supported Partial Unsupported Untested Total
Accessibility 17(view) 2(view) 14(view) 4(view) 37
Internationalization 9(view) 2(view) 25(view) 3(view) 39
Performance 3(view) 0 3(view) 0 6

Mozilla Thunderbird (MacOS)

Category Supported Partial Unsupported Untested Total
Accessibility 25(view) 0 7(view) 5(view) 37
Internationalization 22(view) 0 0 17(view) 39
Performance 4(view) 0 1(view) 1(view) 6

Mozilla Thunderbird (Windows)

Category Supported Partial Unsupported Untested Total
Accessibility 0 0 0 37(view) 37
Internationalization 0 0 0 39(view) 39
Performance 1(view) 0 0 5(view) 6

Samsung Email (Android)

Category Supported Partial Unsupported Untested Total
Accessibility 31(view) 1(view) 2(view) 3(view) 37
Internationalization 30(view) 2(view) 7(view) 0 39
Performance 6(view) 0 0 0 6

SFR (Desktop webmail)

Category Supported Partial Unsupported Untested Total
Accessibility 23(view) 2(view) 6(view) 6(view) 37
Internationalization 22(view) 0 1(view) 16(view) 39
Performance 6(view) 0 0 0 6

SFR (iOS)

Category Supported Partial Unsupported Untested Total
Accessibility 22(view) 1(view) 8(view) 6(view) 37
Internationalization 20(view) 0 1(view) 18(view) 39
Performance 4(view) 0 2(view) 0 6

SFR (Android)

Category Supported Partial Unsupported Untested Total
Accessibility 21(view) 0 7(view) 9(view) 37
Internationalization 19(view) 0 1(view) 19(view) 39
Performance 4(view) 0 1(view) 1(view) 6

Orange (Desktop webmail)

Category Supported Partial Unsupported Untested Total
Accessibility 11(view) 2(view) 12(view) 12(view) 37
Internationalization 6(view) 2(view) 10(view) 21(view) 39
Performance 4(view) 0 2(view) 0 6

Orange (iOS)

Category Supported Partial Unsupported Untested Total
Accessibility 10(view) 2(view) 13(view) 12(view) 37
Internationalization 8(view) 2(view) 8(view) 21(view) 39
Performance 3(view) 0 3(view) 0 6

Orange (Android)

Category Supported Partial Unsupported Untested Total
Accessibility 11(view) 2(view) 9(view) 15(view) 37
Internationalization 8(view) 2(view) 6(view) 23(view) 39
Performance 3(view) 0 2(view) 1(view) 6

ProtonMail (Desktop webmail)

Category Supported Partial Unsupported Untested Total
Accessibility 29(view) 4(view) 4(view) 0 37
Internationalization 37(view) 1(view) 1(view) 0 39
Performance 3(view) 1(view) 2(view) 0 6

ProtonMail (iOS)

Category Supported Partial Unsupported Untested Total
Accessibility 29(view) 1(view) 6(view) 1(view) 37
Internationalization 37(view) 0 2(view) 0 39
Performance 3(view) 1(view) 2(view) 0 6

ProtonMail (Android)

Category Supported Partial Unsupported Untested Total
Accessibility 26(view) 1(view) 6(view) 4(view) 37
Internationalization 38(view) 0 1(view) 0 39
Performance 2(view) 1(view) 2(view) 1(view) 6

HEY (Desktop webmail)

Category Supported Partial Unsupported Untested Total
Accessibility 11(view) 3(view) 13(view) 10(view) 37
Internationalization 13(view) 0 5(view) 21(view) 39
Performance 4(view) 0 2(view) 0 6

Mail.ru (Desktop webmail)

Category Supported Partial Unsupported Untested Total
Accessibility 16(view) 3(view) 14(view) 4(view) 37
Internationalization 33(view) 0 6(view) 0 39
Performance 2(view) 0 4(view) 0 6

Fastmail (Desktop webmail)

Category Supported Partial Unsupported Untested Total
Accessibility 20(view) 0 6(view) 11(view) 37
Internationalization 16(view) 0 2(view) 21(view) 39
Performance 2(view) 0 4(view) 0 6

LaPoste.net (Desktop webmail)

Category Supported Partial Unsupported Untested Total
Accessibility 19(view) 1(view) 6(view) 11(view) 37
Internationalization 18(view) 0 1(view) 20(view) 39
Performance 5(view) 0 1(view) 0 6

T-online.de (Desktop webmail)

Category Supported Partial Unsupported Untested Total
Accessibility 2(view) 1(view) 4(view) 30(view) 37
Internationalization 1(view) 0 0 38(view) 39
Performance 0 0 0 6(view) 6

Free.fr (Desktop webmail)

Category Supported Partial Unsupported Untested Total
Accessibility 4(view) 0 1(view) 32(view) 37
Internationalization 1(view) 0 0 38(view) 39
Performance 1(view) 0 0 5(view) 6

GMX (Desktop webmail)

Category Supported Partial Unsupported Untested Total
Accessibility 10(view) 2(view) 19(view) 6(view) 37
Internationalization 4(view) 2(view) 28(view) 5(view) 39
Performance 1(view) 0 4(view) 1(view) 6

GMX (iOS)

Category Supported Partial Unsupported Untested Total
Accessibility 23(view) 0 1(view) 13(view) 37
Internationalization 26(view) 1(view) 0 12(view) 39
Performance 4(view) 0 1(view) 1(view) 6

GMX (Android)

Category Supported Partial Unsupported Untested Total
Accessibility 12(view) 0 12(view) 13(view) 37
Internationalization 22(view) 0 5(view) 12(view) 39
Performance 2(view) 0 3(view) 1(view) 6

WEB.DE (Desktop webmail)

Category Supported Partial Unsupported Untested Total
Accessibility 9(view) 1(view) 18(view) 9(view) 37
Internationalization 4(view) 2(view) 28(view) 5(view) 39
Performance 1(view) 0 4(view) 1(view) 6

WEB.DE (iOS)

Category Supported Partial Unsupported Untested Total
Accessibility 21(view) 0 0 16(view) 37
Internationalization 26(view) 1(view) 0 12(view) 39
Performance 4(view) 0 1(view) 1(view) 6

WEB.DE (Android)

Category Supported Partial Unsupported Untested Total
Accessibility 10(view) 0 11(view) 16(view) 37
Internationalization 22(view) 0 5(view) 12(view) 39
Performance 2(view) 0 3(view) 1(view) 6

1&1 (Desktop webmail)

Category Supported Partial Unsupported Untested Total
Accessibility 16(view) 1(view) 4(view) 16(view) 37
Internationalization 22(view) 0 5(view) 12(view) 39
Performance 2(view) 0 3(view) 1(view) 6

1&1 (Android)

Category Supported Partial Unsupported Untested Total
Accessibility 10(view) 0 11(view) 16(view) 37
Internationalization 22(view) 0 5(view) 12(view) 39
Performance 2(view) 0 3(view) 1(view) 6