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Office 365 postmaster / NDR

I have a few domains that are pointed to office 365 and then to our internal servers.

Currently if an address doesnt exist a user gets an email from the postmaster account postmaster@company3.co.uk no matter what domain an email was set to.

is there a way to change this so that if an email comes in for @company1.co.uk the postmaster address is postmaster@company1.co.uk
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CaptainGiblets
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CaptainGiblets
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1 Solution
 
Mark GalvinManaging Director / Principal ConsultantCommented:
Hi

Annoyingly you can only have one Postmaster address per tenant. for clients that I support where they have multiple domains I either register a new domain, add that to Office 365 and set the postmaster to that (GoDaddy domains are cheap as chips) or just set the postmaster to the the domain.onmicrosoft.com default.

Using https://technet.microsoft.com/en-gb/library/jj983445(v=exchg.150).aspx OR https://msryanph.wordpress.com/2013/08/02/managing-postmaster-setting-in-exchange-online-365/ you can change the default.
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CaptainGibletsAuthor Commented:
Is there a way to disable NDR's? i cant seem to find anything on the web. Or to not fail incorrect email addresses.
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CaptainGibletsAuthor Commented:
Strange that they give you a way to block them on premises but not when hosted in 365 :(  oh well! thanks for your help!
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