[CentOS] question on sending mail with 5.2

I made a little file with a From:, To: and body.
I execute the command cat file.txt | sendmail -t -O MinQueueAge=1m

thinking that the message would try every minute to send instead of the 
default 30m. (if the initial attempt failed of course).

This doesnt seem to have any effect?

In the event I have an important email and I want it try perhaps every 
minute (1minute)
to send the email how do I accomplish this from the sendmail command line?

Thanks,

jerry