Mails are not recieved on the users mail box ,when an email is sent to a mail group

Hi

We use exchange 2007 and outlook 2010 and I have sent a mail to all staff mail group (300 Staffs).
None of the staff are receiving the email which I sent and I was supposed to receive a copy and i have not received this email as well.

I tried few things, when i send an email to myself  i receive and also if i send to my colleague he receives. Only when i sent the email to this mail group the staffs are not receiving and also I am not receiving any NRD reports on my inbox and checked the junk mail as well.

When i open the sent folder i can see that the mail is listed on the sent item. Previously I used to send email to this group an it used to work successfully.

On the Exchange server C: Drive the free space is 3.95GB
D drive is where the Exchange database located, the free space is 70GB

There is another mail group(100 recipients) and if I send email to this mail group , it works.

Please suggest how to trouble shoot this.

Thanks in advance
lianne143Asked:
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Chad FranksSenior System EngineerCommented:
Please check your recipient policies to make sure its not set too low.  If you have it set lower than 300, the email won't be delivered..
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lianne143Author Commented:
Please post  me some tutorials as where this setting would be set
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