Inbound and Outbound 365 SMTP Filtering Mailguard

April 20, 2016
Research
0 Comments
paris

What you need to do to enable Mailguard Filtering and Office 365

Inbound Filter by IP

This forces all internal mail to only be accepted by 365 from Mailguard IP’s. Spammers start caching DNS records so even though you changed MX records they use old ones!

Exchange Administration
Mailflow
Connectors

From Partner Organization
To Office 365
How do you want to identify the partner organization? Domain
Specify one or more sender domains: *
Reject email messages if they aren’t sent from within this IP address range ( IP Range from Mailguard )

203.21.125.32/32
69.16.202.203/32
174.36.235.195/32
69.16.202.216/32
50.23.246.238/32
50.23.252.166/32
108.168.255.216/32
108.168.255.217/32
203.21.125.33/32

Outbound Filter forcing SMTP relay

Make sure all Office 365 IP’s http://pastebin.com/6UZZcWPQ are in trusted networks

Exchange Administration
Mailflow
Connectors

Only when I have a transport rule set up that redirects messages to this connector – Tick
Route email through these smart hosts : filter.riskca-1.mailguard.com.au
Always use Transport Layer Security (TLS) to secure the connection (recommended)

Exchange Administration
Mailflow
Rules

Name : Relay Outbound through MailGuard
*Apply this rule if… – The Sender is Located … Inside the organization
*Do the following… : Use the following connector Name of Connector Above

SMTP SPF

Add this include to the TXT record for the outgoing domains

include:customer.mailguard.com

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