Distribution groups and security groups

Is secure or correct use distribution groups or security groups to receive emails from outside?

The clients send emails direct to groups
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David SankovskySenior SysAdminCommented:
Security Groups Are usually used to apply security permissions to a large amount of people without actually going one by one (For example, in File Servers, create a folder for the Sales Department, and only give members of the Sales Security Group access to that Folder)

Distribution Groups as the name suggests, Are specialized Groups - mails send to a Dist. Group will be delivered to each and every member of the group.

Keep in mind though, if a user is part of two distribution groups, and the same mail was sent to both, more often than not, the user will receive the mail twice.

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ChrisSenior Technical ArchitectCommented:
where appropriate we combine Distribution groups as security groups so that you can reduce group membership for a user i.e. Sale Team team is put into a group and this can be used to give access to the Sales Team file share and the sales team email distribution group

With 2010 onwards they are Universal groups which has AD impacts in terms of replication but this is only a minor concern
PLCITSAuthor Commented:
Ooh I see but is secure open a distribution group to accept messages from everyone? not just authentuicate users?
ChrisSenior Technical ArchitectCommented:
The security settings of who can send to it is controlled by exchange and has no effect on it as a security group so that determined by business requirements
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