Notes

I wanted to create a dynamic distribution group in Exchange 2019 and wanted to include two kinds of users:

1. Users where the Company field has a specific value
2. Users that are members of a specific security group

The motivation was that our company has several sites. The Company states if a user is member of a site. And there are also users, that move between the sites. These users should be added using the security group.

To achieve this, I created the following recipient filter for the distribution group (indentation included for better readability):

(
    (
        (
            (
                (Company -eq 'My company')
                -or
                (MemberOfGroup -eq 'CN=my-group,OU=groups,DC=mycompany,DC=local')

            )
            -and
            (
                (
                    (RecipientType -eq 'UserMailbox')
                    -or
                    (RecipientType -eq 'MailUser')
                )
            )
        )
    )


    -and (-not(Name -like 'SystemMailbox{*')) -and (-not(Name -like 'CAS_{*')) -and (-not(RecipientTypeDetailsValue -eq 'MailboxPlan')) -and (-not(RecipientTypeDetailsValue -eq 'DiscoveryMailbox')) -and (-not(RecipientTypeDetailsValue -eq 'PublicFolderMailbox')) -and (-not(RecipientTypeDetailsValue -eq 'ArbitrationMailbox'))-and (-not(RecipientTypeDetailsValue -eq 'AuditLogMailbox')) -and (-not(RecipientTypeDetailsValue -eq 'AuxAuditLogMailbox')) -and (-not(RecipientTypeDetailsValue -eq 'SupervisoryReviewPolicyMailbox'))
)

The import part is (Company -eq 'My company') -or (MemberOfGroup -eq 'CN=my-group,OU=groups,DC=mycompany,DC=local'). The long part at the bottom is the default filter.
There are some important things:

• You must specify the distinguished name for the group
• The users must be direct member of the group, nested groups do not work.

But hey, it works :)