Changing Domain Names

A few questions: Overall it is not a difficult process but depends on your setup.

1. Are you setting up a completely new tenant, assuming you are M365?

If setting a completely new tenant then setup AD Sync for the tenant so mailboxes are created 

Setup MailFlow or Gateway for the new domain. This allows you to keep accepting email for both domains. Remember Sophos doesn't license domains, it licenses mailboxes so you could have multiple domains tied to one tenant.

2. If not, are you adding just an Authoritative Domain in M365?

I've setup multiple domains in a single tenant and send/receive for those domains. Secondary domains become alias addresses to the primary domain.

I would suggest contacting your Sophos SE and maybe engaging our Professional Services org to assist.

/Tom

A few questions: Overall it is not a difficult process but depends on your setup.

1. Are you setting up a completely new tenant, assuming you are M365?

If setting a completely new tenant then setup AD Sync for the tenant so mailboxes are created 

Setup MailFlow or Gateway for the new domain. This allows you to keep accepting email for both domains. Remember Sophos doesn't license domains, it licenses mailboxes so you could have multiple domains tied to one tenant.

2. If not, are you adding just an Authoritative Domain in M365?

I've setup multiple domains in a single tenant and send/receive for those domains. Secondary domains become alias addresses to the primary domain.

I would suggest contacting your Sophos SE and maybe engaging our Professional Services org to assist.

/Tom

We do not use M365. Our current domain is a .org and we are moving to a .gov. Our email is inhouse on Zimbra and we use Sophos email gateway for both incoming and outgoing mail traffic. Currently, our users are sync'd with Sophos via AD Sync. We are still questioning if our internal domain, AD, even needs to change as our users do not require the right side of their email to login to the network.

How do I find our SE?

DAve

OK, so your MX record points to your on-premise Zimbra server probably via a NAT address on your firewall. Simply put then add the .gov to your Zimbra server as an accepted domain and point it to the current MX address. I can't address your internal AD domain question but in order for mailboxes to synch correctly you will need to setup synch for the .gov domain.

Good question on how to find your SE? Send me your company name, location to my email address tom[.]foucha@sophos[.]com

Our MX points to Sophos and Sophos scans and relays the traffic to us. We accept no traffic from outside except from Sophos. We also route all outbound traffic through Sophos as well. 

I have sent you our information.

Thanks,

Dave

You would setup the .gov domain just like you have the .org domain under Domains Settings/Status and configure directory synch the same way you have it for the .org but pointing to the .gov area.

I've made contact with the SE for your area and will be working with him to assist or engage resources you might need.