Sendmail - not sending mail

[nim86kyouya]

Hi, i need help with this matter since i'm not use with sendmail configuration.

I have application place in linux server, the OS is redhat and sending email using sendmail 8.13.
unfortunately the OS was corrupted and was repaired. But after the repair, my application can't send an email any more. I checked the sendmail and it's OK but in maillog, all the email send after the OS incident was queued and not send.

I try telnet 127.0.0.1 25, it's OK but the email still stuck at queue.
I try to flush the queue but got error Name server timeout
Transient parse error -- message queued for future delivery
and it's seem like the sendmail was configure to use SMARTHOST.
It look like the sendmail was ok,but something has blocked my email from being sent out.


Hope someone can guide me how to troubleshoot this matter, I'm just beginner in linux.

Sorry if I have grammatical error since English not my first language
Thanks for anybody's time