How do I send a file as an email attachment using Linux command line?

Or, failing mutt:

gzip -c mysqldbbackup.sql | uuencode mysqldbbackup.sql.gz  | mail -s "MySQL DB" [email protected]

None of the mutt ones worked for me. It was thinking the email address was part of the attachment. Had to do:

echo "This is the message body" | mutt -a "/path/to/file.to.attach" -s "subject of message" -- [email protected]