mailx

Send and receive mail. More information: https://manned.org/mailx.

mailx -s "subject" to_addr

echo "content" | mailx -s "subject" to_addr

mailx -s "subject" to_addr < content.txt

mailx -s "subject" -c cc_addr to_addr

mailx -s "subject" -r from_addr to_addr

mailx -a path/to/file -s "subject" to_addr