Email group is not receiving email sent SSIS configuration file

I am using various email addresses to send process success emails. All the email addresses receiving emails accept the newly added group.DBAs@abc.com is not receiving email. It's a group. all others are receiving emails. sample:

<Configuration ValueType="String" 
           Path="\Package.Variables[User::EmailTo].Properties[Value]" 
           ConfiguredType="Property">

<ConfiguredValue>
tim@abc.com;DBAs@abc.com;kl@abc.com;hj@abc.com
</ConfiguredValue>

</Configuration>

</DTSConfiguration>