Manos123 Posted July 30, 2021 Report Share Posted July 30, 2021 We are using Exchange online and we are forwarding emails to an external MTA from Digital Guardian. We are trying to improve the overall high availability of the solution so that when / if the MTA (Digital Guardian) becomes unavailable, to continue forwarding the emails directly from Microsoft exchange online until Digital Guardian appliances become available again. What is the best way to approach this? Quote Link to comment Share on other sites More sharing options...
klag Posted August 27, 2021 Report Share Posted August 27, 2021 If i can understand well, everyone who sends you mails they are going to Digital Guardian, and from there you are "forwarding" them to Office 365. the simple way is to make a second MX Record to your DNS pointing at Office 365 directly, with higher Pref If you have an Mx Record pointing to Digital Guardian with Pref 10 , Make a second Mx Record Pointing Office 365 with Pref 20. If the First Mail Server (Digital Guardian) is not responding then the sender mail server will look for second mx record if exists and will send mail directly to Office 365 Exchange Server. If you mean that all your outgoing mails are sending from Office 365 to Digital Guardian, and then Digital Guardina forwards all mails to the recepient mail, the question is > why are you doing that ? Quote Link to comment Share on other sites More sharing options...
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