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Sophos UTM and Mimecast MSO

Hi all,

Anyone using Mimecast Services for Outlook? I've just replaced our old firewall with a Sophos UTM, but now the MSO can't connect out to Mimecast's web services.
I've added a firewall rule from  -> HTTP/S -> Mimecast's DNS Host Groups (I've also tried Any) but still no luck.

Hoping someone else has seen this and resolved it!!

Thanks

Alex


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