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Found that outgoing mails not successfully in Exchange 2010 server

This is using MS Exchange 2010 server in 2008 r2 AD Domain. Recently, found that sometimes outgoing mails may failed. I checked from the queue viewer, that are always few mails in queue with retry state. Most of them having the error as follows:

    Last Error: 421 4.4.2 Connection dropped due to socketError

   Last Error: 421 mail.recipient.com Error: timeout exceeded

Incoming mails are working fine. Why these outoging mails failed?

1 Solution
You must configure a reverse DNS record for the domain name called a PTR record. This record is not controlled by your DNS it has to be setup with the ISP. Some organizations will not accept mail if no reverse DNS exists.
MezzutOzilAuthor Commented:

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