IPC

-o message-header=EMAIL HEADER
This option allows you to specify additional email headers to be included.
To add more than one message header simply use this option on the command
line more than once. If you specify a message header that sendEmail would
normally generate the one you specified will be used in it's place.
Do not use this unless you know what you are doing!
Example:
To scare a Microsoft Outlook user you may want to try this:
-o message-header="X-Message-Flag: Message contains illegal content"
Example:
To request a read-receipt try this:
-o message-header="Disposition-Notification-To: <user@domain.com>"
Example:
To set the message priority try this:
-o message-header="X-Priority: 1"
Priority reference: 1=highest, 2=high, 3=normal, 4=low, 5=lowest

sendEmail -f $SMTPFROM -t $SMTPTO -u $1 -m $2 -s $SMTPSERVER -xu $SMTPUSER -xp $SMTPPASS

sendEmail -f $SMTPFROM -t $SMTPTO -u $1 -m $2 -s $SMTPSERVER -xu $SMTPUSER -xp $SMTPPASS -o message-header="X-Priority: 1"