I have deployed mail server in the intranet. Whenever I try to send email from my corporate email server, the mail does not get delivered. Gives error like IP not found. But when I deploy mail server on DMZ (cloud), it works.
So when both corporate email server & my test mail server are in same intranet, why the email gets bounced?
On
Maybe you should run a test on your email server to make sure you don't have any config problems. You could try http://www.emailsecuritygrader.com it's a free online tool that I think works well. It runs a series of security tests on all mail servers defined in the MX record for your domain and will give you recommendations on the problems found.
Check DNS MX record for the domain from the email address used in To: field. The sending server will try to deliver your email to one of the MX-servers first.