Re: Permit send email from different user group to diferent domain
It is difficult to say without knowing the network topology, but by the looks of it I would initially say your requirement is best addressed at the internal MTA / Exchance server, through send connectors and trusts.
MEG would be more like a point of entry for Internet mail into your organization (or a point of exit for outbound mail), I would expect that other internal/trusted traffic does not necessarily need to traverse MEG.
Having said that, it is definitely possible to set up protocol presets / policy rules based on user membership of a specific LDAP group or organizational unit.
If you can be more specific about what the local topology is, and some of the external interactions I may be able to advise further.
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