Messaging Gateway

Hi, recently my company is receiving the mail which will send to all the people. I check that the SBG has the aliases feature which is similar with the EXPN but in the aliases I only configure for some people only. The email team has disable the EXPN features and we don't have the email address for that group also. May I know is it the SBG has any hidden configuration that will automatic send even the email server does not have this email address for that group? Please advise.

Are you asking about distribution list expansion? If you have an LDAP source configured, we have that feature you can turn on.

Hi we don't turn on the LDAP with the SBG but some how the mails can be expansion to the other user.

You SHOULD turn on LDAP.  It's much better in SBG 9 than in any previous version.  How are you doing recipient validatation without it?

For me, I'm not clear what you are asking for.  Could you give us an example?

As because some constraint, I cannot turn on the LDAP with the SBG. I understand the benefit of turning on the LDAP with SBG also.

Currently, the mail server will notify the SBG that the users are valid or not.

My situation that in the mail server we have configure a ABC group but this ABC group does not have the email address. In logical, the sender cannot send the email to this group due to no email address. But now the sender can send the email to this group which causing trouble.

I'm not an exchange expert but EXPN is a different function than a Distribution List isn't it?  You could possibly create a compliance policy for the "Group" address that forwards it to the users in that group.  So essentially the condition would be emails to the group abc@domain.com and you would have multiple "Forward the message" actions (one for each user in the group).  This would to an extent create a distribution list.

How about using Protocols, Aliases.

From help:

About aliases and address masquerades:  An alias translates an email address into one or more destination addresses

Source                          Destination

help@example.com      anybody@example.com, anyone@example.com, someone@example.com, somebody@example.com

From what I read, the EXPN and distribution list are similar. Please correct me if I am wrong.

But I don't see any idea that can use the policies to prevent it.

Yes, aliases can do this. As the aliases is similar to group, when I am sending to abc@domain.com; it will send the mail to the users under the aliases. But now the Lotus Notes Server does not have this email address & it is managed to send to the group at the Lotus Notes Server.