A mail server is like a digital post office that processes and delivers emails. It stores and organizes incoming messages and sends them to the intended recipients. Full definition
The email gets sent by the client to an outgoing mail server via Simple Mail Transfer Protocol. (howtogeek.com)
I take it the emails were NOT hosted on a university mail server? (climateaudit.org)
I'm amazed that Stringer didn't call Acton to explain that if the emails were being deleted for space reasons on the UEA server, why did Phil Jones ask Mann to delete them on mail servers in America? (climateaudit.org)