Can you specify a subject for an email when using sendmail at the command line to send an email?

My problem is a certain isp will not accept email with out a valid domain for the sender. Sendmail allows you to specify a sender with the -f switch. The 'mail' command allows a subject, but sendmail doesn't seem to have a switch for subject. Conversely, does 'mail' have a way to specify the sender, like sendmail does?

Thanks.

mail -s "test email" -u sender receiver@domain.com << EOF
....
message goes here.
....

EOF

however, you can't specify the -u sender as "user@domain.com", only "user". The ISP wants "user@domain.com".

Say I have the following line in a shell script:

cat /var/log/messages | grep ${PID} | sendmail -froot@domain.com -t myself@domain.com

Ok. So sendmail can apparently parse out the headers of an email message, including 'Subject:', but the man page docs don't quite give me enough info, or I'm getting my piping wrong. I made the following attempt:

echo "Subject: Testing" `cat /var/log/messages | grep ${PID}` | sendmail -froot@domain.com -t myself@domain.com

I get an email with the entire echo'd string as the Subject. Also, the echo seems to do away with the crlf's at the end of each line of the cat|grep command. How does one tell sendmail where the header info ends, and the message begins? Can I structure this command so I don't have to echo the results of the cat so the crlf's are blown away?

I'm trying to grep the messages associated with a UPS daemon in the event of a power failure, and send off an email to the appropriate people.

Thanks.

d'oh, Found it:

http://www.linuxquestions.org/questions/history/206093