neomutt
NeoMutt command line email client.
TLDR
Open the specified mailbox
$ neomutt -f [path/to/mailbox]
Start writing an email and specify a subject and a cc recipient
$ neomutt -s "[subject]" -c [cc@example.com] [recipient@example.com]
Send an email with files attached
$ neomutt -a [path/to/file1 path/to/file2 ...] -- [recipient@example.com]
Specify a file to include as the message body
$ neomutt -i [path/to/file] [recipient@example.com]
Specify a draft file containing the header and the body of the message, in RFC 5322 format
$ neomutt -H [path/to/file] [recipient@example.com]