Exchange On-Premises with Mimecast

[mgriffith]

I have an on-premises Exchange 2019 server with PMG sitting in the DMZ as a second layer (first on the way out I guess) of anti-spam/anti-malware filter with Mimecast in the cloud being the first in line. I've gotten incoming email routing properly through Mimecast and PMG but can't figure out how to get outgoing through Mimecast. I used their IPs and/or corresponding subdomains in the Outgoing TLS settings but to no avail. Currently outgoing is working fine it just isn't routing through Mimecast. Any assistance would be appreciated.

Thanks in advance.

 

[Stoiko Ivanov]

To route mail to the internet through some other servive (mimecast in your case) in PMG you usually just need to set a smarthost - see:
https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#pmgconfig_mailproxy_relaying

I hope this helps!

 

[mgriffith]

To route mail to the internet through some other servive (mimecast in your case) in PMG you usually just need to set a smarthost - see:
https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#pmgconfig_mailproxy_relaying

I hope this helps!

Thanks, I've been trying to get that configuration right. But in the end, I've decided to route outbound straight to Mimecast and keep inbound flowing through PMG from Mimecast and on to Exchange.

Thanks again for the assist.