Who is postmaster in exchange

The transport servers use Postmaster defaultaccepteddomain as the external postmaster address if it is not explicitly set by the administrator. This will work fine for organizations that have their default domain as their external domain name externaldomain. But, if you have your AD domain as your default accepted domain, you need to change the postmaster address to an external routable address.

As per RFC standards, all domains should have a postmaster address configured and should be able to receive emails that come to that address.

Hence you either need a mailbox for the postmaster or add the email address to an existing account. Menu Home About. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. The external postmaster address is used as the sender for system-generated messages and notifications sent to message senders that exist outside your Microsoft Exchange Online organization.

An external sender is any sender that has an email address in a domain that isn't configured as an accepted domain in your organization. By default, the value of the external postmaster address setting is blank.

You need to be assigned permissions before you can perform this procedure or procedures. To see what permissions you need, see the "Mail flow" entry in the Feature permissions in Exchange Online topic. You can only use Exchange Online PowerShell to perform this procedure. This example sets the external postmaster address to the value postmaster contoso. Ask for help in the Exchange forums. Visit the forums at Exchange Server.

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