Active directory integration with multiple AD domains?

[CGRE]

I dont think this is possible but does anyone know if an MX will support AD integration with multiple AD domains, we have a customer with 6x domains and wants to use the AD integration piece on the MX's but on reading all of the documentation it does point to supporting a single AD domain not multiple?

[cmr]

Are the domains not trusted by each other, or could they be?

[CGRE]

Unknown at this time, if they do have trusts between would this work, has anyone had this working on an environment like this?

[CGRE]

Also I believe Meraki only still support NTLMv1 which is deemed old and no longer used (disabled) by modern Windows server OS, the documentation doesnt mention this but Meraki support advised it only supports v1 and there are no current plans for this to change unless anyone knows different?