This can be done with
mutt from the console, which leads to a menu-driven session.
Alternatively, to send a message one can follow these steps,
mail <your-email address> Subject: test This is another test.
The message is furnished with a "Ctrl-D" from the console.
An attempt was made with this,
module load ceuadmin/thunderbird
The package is from https://www.thunderbird.net/en-US/thunderbird/all.
It is necessary to follow instructions here, https://help.uis.cam.ac.uk/service/collaboration/365/exchange-online/how-access-your-mailbox/set-thunderbird-exchange-online.