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not sure where that option is ?
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I set up a distribution group so when email comes in for user &quot;A&quot; it forwards to the distribution group, there are 2 users in the distribution group both local addresses. but when I try to send email to user &quot;A&quot; I get an error:<br />
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Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery.<br />
#&lt; #5.7.1 smtp;550 5.7.1 RESOLVER.RST.AuthRequired;<wbr /> authentication required&gt; #SMTP#
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I set up a distribution group so when email comes in for user "A" it forwards to the distribution group, there are 2 users in the distribution group both local addresses. but when I try to send email to user "A" I get an error:

Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery.
#< #5.7.1 smtp;550 5.7.1 RESOLVER.RST.AuthRequired; authentication required> #SMTP#

Exchange forward to distribution group

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.