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49 products we track here. 10 carry at least one documented attribute; the rest are named because leaving them out would hide where our research has not been.

49 products

Best documentedNameVendor Documented only 10
Select two products to compare them side by side. Only two at a time. Untick one to continue. Compare  and Proton Mail and Vivaldi and Hey and Nylas Mail and AOL Mail and Daum and Nate and Alpine and Apache SpamAssassin and Claris Emailer and Eudora and Eudora OSE and Forté Agent and Foxmail and GNOME Evolution and Galaxy Store and Geary and GroupWise and HCL Notes and Inbox by Gmail and MH Message Handling System and Mozilla Thunderbird and Open-Xchange and Outlook Express and PostPet and The Bat! and Virgilio.it and Zapak and Kontact and MobileMe and Tuta Mail and Alto Mail and Bloomba and Microsoft Entourage and Microsoft Outlook and Microsoft Outlook and Outlook on the web and Outlook.com and RocketMail and Yahoo Mail and Yandex Mail and Zimbra and GNU IceCat and SeaMonkey and Zoho Office Suite and Fastmail and Google Buzz and Pine and Windows Messaging