i installed ubuntu 10.04 and had an application supposed to regularly send mails. initially it was workin but after updates, it stopped. i have tried to re-configure php.ini but still the problem persists. i have also restarted sendmail but in vain. help get out of this problem please.

Check sendmail logs. And try to send a simple mail from terminal, just to see if it works:

echo "subject: test" | sendmail -v you@email.tld
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