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When Exchange server cannot deliver an incoming message, it will generate Delivery Status Notifi cation messages (DSNs) to inform the sender that something unexpected. The causes might be:
etc.
Internal and External Delivery of System Messages
Hub Transport Server uses the Microsoft Exchange Recipient as the sender for system-generated messages.
The Microsoft Exchange recipient is used as the sender for system-generated messages that are sent to internal message senders.
Get-SendConnector | fl name,address*,DNS*
Name : Internet
AddressSpaces : {SMTP:*;1}
DNSRoutingEnabled : True
Get-ReceiveConnector -id "WIN20082\Default WIN20082" | fl name,bindings,permission*
Name : Default WIN20082
Bindings : {0.0.0.0:25}
PermissionGroups : AnonymousUsers, ExchangeUsers, ExchangeServers, ExchangeLe
cyServers
Get-RemoteDomain | fl NDR*
NDREnabled : True
Get-SendConnector | fl name,address*,dns*
Name : Internet
AddressSpaces : {SMTP:*;1}
DNSRoutingEnabled : True
Get-ReceiveConnector -id "TEST1\Default TEST1" | fl name,bindings,permission*
Name : Default TEST1
Bindings : {0.0.0.0:25}
PermissionGroups : AnonymousUsers, ExchangeUsers, ExchangeServers, ExchangeLega
cyServers
Get-RemoteDomain | fl NDR*
NDREnabled : True
Beaty sends e-mail to a non-existent user in its own organization. Microsoft Exchange Recipient sends back the NDR.
Beaty@work.com sends e-mail to tim@work.com, which does not have an e-mail address. Beaty will get a message from Microsoft Exchange Recipient.
Find out Microsoft Exchange Recipient address;
Get-OrganizationConfig | fl MicrosoftExchangeRecipient*
MicrosoftExchangeRecipientEmailAddresses: {SMTP:MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@work.com}
MicrosoftExchangeRecipientReplyRecipient:
MicrosoftExchangeRecipientPrimarySmtpAddress : MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@work.com
MicrosoftExchangeRecipientEmailAddressPolicyEnabled : True
MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@<Accepted Domain>.
The <Accepted Domain> placeholder represents an accepted domain that is used in an e-mail address policy. For every accepted domain that is used in an e-mail address policy, there is a corresponding e-mail address???
New-AcceptedDomain –Name Coupon.com –DomainName Coupon.com
new-EmailAddressPolicy -Name 'Coupon.com' -IncludedRecipients 'AllRecipients' -EnabledEmailAddressTemplates 'SMTP:%m@Coupon.com'
update-EmailAddressPolicy -Identity 'Coupon.com'
Get-OrganizationConfig | fl MicrosoftExchangeRecipient*
MicrosoftExchangeRecipientEmailAddresses: {smtp:MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@work.com, SMTP:MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@Coupon.com}
MicrosoftExchangeRecipientReplyRecipient:
MicrosoftExchangeRecipientPrimarySmtpAddress: MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@Coupon.com
MicrosoftExchangeRecipientEmailAddressPolicyEnabled : True
However
New-AcceptedDomain –Name Idea.com –DomainName Idea.com
new-EmailAddressPolicy -Name 'iDea.com' -IncludedRecipients 'AllRecipients' -ConditionalCompany 'idea' -EnabledEmailAddressTemplates 'SMTP:%m@Idea.com'
update-EmailAddressPolicy -Identity 'iDea.com'
Get-OrganizationConfig | fl MicrosoftExchangeRecipient*
MicrosoftExchangeRecipientEmailAddresses: {smtp:MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@work.com, SMTP:MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@Coupon.com}
MicrosoftExchangeRecipientReplyRecipient:
MicrosoftExchangeRecipientPrimarySmtpAddress: MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@Coupon.com
MicrosoftExchangeRecipientEmailAddressPolicyEnabled : True
MicrosoftExchangeRecipientEmailAddress does not include SMTP:MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@iDea.com.
External Postmaster Address
The external postmaster address is used as the sender for system-generated messages and notifications that are sent to message senders that exist outside the Microsoft Exchange Server 2007 organization. An external sender is any sender that has an e-mail address that contains a domain that is not defined in the list of accepted domains for the Exchange 2007 organization.
John sends e-mail to non-existent user in work.com. Work.com sends back the NDR.
John@canoe.com sends e-mail to www@work.com, which does not exist in work.com organization.
By default, the value of the ExternalPostmasterAddress parameter on every Hub Transport server and Edge Transport server is set to the value $null.
Get-TransportServer | fl ExternalPostmasterAddress
ExternalPostmasterAddress :
For all Hub Transport servers in the Exchange organization or an Edge Transport server that has been subscribed to the Exchange organization, the external postmaster address is postmaster@<Default accepted domain>.
There is no mailbox for postmaster@<Default accepted domain>. If outsider sends mail to this address, it will be automatically dropped.
If you want to receive the mail destined for postmaster address, you could create a mailbox, e.g. pMaster, and point the ExternalPostmasterAddress to it.
Get-TransportServer | Set-TransportServer -ExternalPostmasterAddress pMaster@work.com
Both Microsoft Exchange Recipient and Postmaster don’t have mailboxes. If you send e-mail to these addresses, it will be dropped.
As shown above, the NDR reveals important information -- the recipient's e-mail address was not found in the recipient's e-mail system. Spammer can use the information to guess the e-mail address of your e-mail system. It is better your Exchange organization will not send the important information out to the untrusted organization. The way to control it is by Set-RemoteDomain.
set-remotedomain -id 'Default' -NDREnabled $false
Collect NDRs
Set-TransportConfig –GenerateCopyOfDSNFor "5.1.4", "5.2.0","5.2.4", "5.4.4", "5.4.6", "5.4.8","5.1.1"
Set-OrganizationConfig -MicrosoftExchangeRecipientReplyRecipient 'Shane.Williams@work.com'
Test:
Rob.Prince@work.com sends e-mail to b@work.com, which does not exist.
"b@work.com
#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##" NDR will be delivered to Shane.Williams@work.com.