Restricting sending mail to domain or group

[John Tulp]

Can the groups send and receive from outside the domain ?  If so, it's
going to be difficult to prevent groups from seeing each others emails
because an email that originated from group A could be sent to some
other domain (out on the internet), then get forwarded to a user in
group B.  Just a thought.

On Wed, 2018-12-05 at 18:57 +0100, admin wrote:
> Hi folks,
> 
> has anybody a simple solution for the following request?
> 
> I have a group alias (all at company.com).
> (1) Only company.com accounts should be able to send an email to everybody in that company via all at company.com.
> (2) - rather optional: refine the restrictions, e.g. two groups, grp1 at company.com and grp2 at company.com. Grp1 members should be able to send mails to grp2 but not vice versa.
> 
> What else than sieve would keep dealing with that demands as simple as possible?
> 
> Thanks in advance and sorry for abusing this list for this kind of „problem“ which is not a bug.
> 
> Regards,
> -M