sendmail: Options:
sendmail:   --trust-fromaddr
sendmail:     Accept user-supplied sender address (in Sender or From header) as envelope
sendmail:     sender, otherwise get it from `-f´ parameter or put system username and 
sendmail:     domain name together if `-f´ is missing. Default is --no-trust-fromaddr.
sendmail:   
sendmail:   --relay SERVER-ADDRESS[:PORT]
sendmail:   
sendmail:   --relay-auto-mx
sendmail:   
sendmail:   --auto-qualify (default), --no-auto-qualify
sendmail:     Add our own email domain to unqualified recipient names, ie:
sendmail:     "To: joe" -> "To: joe@example.net"
sendmail:   
sendmail:   --domain DOMAIN
sendmail:     Override system email domain which is otherwise got from /etc/maildomain, 
sendmail:     or `domainname´ command.
sendmail:   
sendmail:   -f, --from ADDRESS
sendmail:     Specify envelope sender address (MAIL FROM address)
sendmail:     Can be overridden by --trust-fromaddr
sendmail:   
sendmail:   -F NAME
sendmail:     Add or replace real name in `From´ header
sendmail:   
sendmail:   -t, -i, -ti
sendmail:   
sendmail:   --debug
sendmail:     Debug SMTP conversation
sendmail:   
sendmail:   --progress-counter
sendmail:     Show a counter how much data was sent
sendmail:   
sendmail:   --save-sent DIR
sendmail:   --save-failed DIR
sendmail:     Save sent/failed email in file in DIR directory