Account Settings - Mimecast Gateway Configuration

This article contains information on configuring the Mimecast Gateway, including updating SMTP send connectors, journaling connectors, MX records, and inbound/outbound email routing to ensure secure and efficient email delivery for your organization.

The Mimecast Gateway is a cloud-based service that provides available services to your organization. Messages are routed from your organization to Mimecast for outbound delivery, and MX records are pointed to us for inbound delivery. The gateway's implementation is typically completed via the Connect Application or Connect Process.

Using the Mimecast Gateway

To route your messages via the Mimecast Gateway, you must update your SMTP send connectors for outbound mail and journaling, and also your MX records for inbound mail flow.

You must allow connections to the appropriate ports from all Mimecast regional IP ranges, and ensure they're mapped through to the correct destination on your network. View the Mimecast Data Centers and URLs page for more information.

Send Connectors

Update your organization’s send connectors and journal connectors (if applicable), using the hostnames displayed below.

Outbound Send Connectors

Standard accounts are for customers using on-premise, cloud or hosted email services. If you are using Microsoft 365, Mimecast provides dedicated hostnames as shown in the table below.

Region	Standard Account Hostnames	Microsoft 365 Account Hostnames
Europe (Excluding Germany)	eu-smtp-outbound-1.mimecast.com eu-smtp-outbound-2.mimecast.com	eu-smtp-o365-outbound-1.mimecast.com eu-smtp-o365-outbound-2.mimecast.com
Germany	de-smtp-outbound-1.mimecast.com de-smtp-outbound-2.mimecast.com	de-smtp-o365-outbound-1.mimecast.com de-smtp-o365-outbound-2.mimecast.com
United States of America (B)	usb-smtp-outbound-1.mimecast.com usb-smtp-outbound-2.mimecast.com	usb-smtp-o365-outbound-1.mimecast.com usb-smtp-o365-outbound-2.mimecast.com
United States of America	us-smtp-outbound-1.mimecast.com us-smtp-outbound-2.mimecast.com	us-smtp-o365-outbound-1.mimecast.com us-smtp-o365-outbound-2.mimecast.com
Canada	ca-smtp-outbound-1.mimecast.com ca-smtp-outbound-2.mimecast.com	ca-smtp-o365-outbound-1.mimecast.com ca-smtp-o365-outbound-2.mimecast.com
South Africa	za-smtp-outbound-1.mimecast.co.za za-smtp-outbound-2.mimecast.co.za	za-smtp-o365-outbound-1.mimecast.co.za za-smtp-o365-outbound-2.mimecast.co.za
Australia	au-smtp-outbound-1.mimecast.com au-smtp-outbound-2.mimecast.com	au-smtp-o365-outbound-1.mimecast.com au-smtp-o365-outbound-2.mimecast.com
Offshore	je-smtp-outbound-1.mimecast-offshore.com je-smtp-outbound-2.mimecast-offshore.com	je-smtp-o365-outbound-1.mimecast-offshore.com je-smtp-o365-outbound-2.mimecast-offshore.com

Journaling Send Connectors

You must configure a dedicated send connector for SMTP journal traffic. If your environment doesn't allow this, use the send connector address as specified above.

Region	Hostname
Europe (Excluding Germany)	eu-smtp-journal-1.mimecast.com eu-smtp-journal-2.mimecast.com
Germany	de-smtp-journal-1.mimecast.com de-smtp-journal-2.mimecast.com
United States of America	us-smtp-journal-1.mimecast.com us-smtp-journal-2.mimecast.com
United States of America (B)	usb-smtp-journal-1.mimecast.com usb-smtp-journal-2.mimecast.com
Canada	ca-smtp-journal-1.mimecast.com ca-smtp-journal-2.mimecast.com
South Africa	za-smtp-journal-1.mimecast.co.za za-smtp-journal-2.mimecast.co.za
Australia	au-smtp-journal-1.mimecast.com au-smtp-journal-2.mimecast.com
Offshore	je-smtp-journal-1.mimecast-offshore.com je-smtp-journal-2.mimecast-offshore.com

MX Records

Update your organization's Zone File MX Records, using the appropriate entries from the table below.  The hostnames should be added with the same priority to ensure round robining and failover.

Function	Region	Hostname
MX records (inbound)	Europe (Excluding Germany)	eu-smtp-inbound-1.mimecast.com eu-smtp-inbound-2.mimecast.com
	Germany	de-smtp-inbound-1.mimecast.com de-smtp-inbound-2.mimecast.com
	United States of America	us-smtp-inbound-1.mimecast.com us-smtp-inbound-2.mimecast.com
	United States of America (B)	usb-smtp-inbound-1.mimecast.com usb-smtp-inbound-2.mimecast.com
	Canada	ca-smtp-inbound-1.mimecast.com ca-smtp-inbound-2.mimecast.com
	South Africa	za-smtp-inbound-1.mimecast.co.za za-smtp-inbound-2.mimecast.co.za
	Australia	au-smtp-inbound-1.mimecast.com au-smtp-inbound-2.mimecast.com
	Offshore	je-smtp-inbound-1.mimecast-offshore.com je-smtp-inbound-2.mimecast-offshore.com

We recommend a preference/cost of 10 for both entries, but a different value may be chosen as long as both Mimecast entries are equal.