mutt -s SUBJECT -a ATTACHMENT_FILE EMAIL_ADDRESS < MESSAGE_FILE

mpack -s SUBJECT -D MESSAGE_FILE ATTACHMENT_FILE EMAIL_ADDRESS

echo -e "to: receiver@domain.tldnsubject: subjectn"| (cat - && uuencode /path/to/attachment attachment.name) | ssmtp sender@gmail.com

$ sudo apt-get install uudeview
 $ echo -e "From: myaddress@mydomain.comnTo: youraddress@yourdomain.comnSubject: mySubjectnnBody-Text"|uuenview -a -bo MyAttachment|sendmail -t

$ echo -e "to: receiver@domain.tldnsubject: testn"| (cat - && uuencode /path/to/file file.name) | ssmtp sender@gmail.com