olemus
brauseri kaudu kasutatav veebipõhine elektronpost, mille klient on teostatud veebiserveril töötava veebirakendusena
Wiktionary:
a service for sending, receiving, and/or storing email, usually on a remote web server, in such a way that it is accessible through a web browser
Hotmail, Yahoo! Mail and Gmail are well-known webmail services.

ülevaateid
https://www.techopedia.com/definition/5410/webmail
https://en.wikipedia.org/wiki/Webmail
https://www.computertechreviews.com/definition/webmail/amp/

turvalisus
https://help.one.com/hc/en-us/articles/6864084675345-How-to-work-safer-with-Webmail
https://www.consumerreports.org/cro/news/2013/03/4-reasons-not-to-use-webmail/index.htm