Email Not Delivered to Google Apps Mail Box

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http://serverfault.com – We have a query regarding the non delivery of email from google apps mail account. We are using google apps mail in our Organization. We found that in specific mails from One mail box is not being delivered to another mail box and no bounce emails too. For example, Mail from "user 1" is not reaching "user 2" At the same time, mails from other users are reaching "user 2" user 2 is under a mail group. When user 1 send an email to the same mail group, user 2 is not receive that mail as well. We don't have any error message or mail bounces in this regards and we don't find any clues in this (HowTos)