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undesirable sending mail from client Exchange 2013

Twice a week one of my client receive bounce mail (sending mail to invalid email addresses) from exchange server. I can extract the log from exchange but there no email into sent folder in the outlook client. how can I find who send this undesirable mail and how can I fix that. We have exchange 2013 and my users have Outlook 2010
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Stéphane Boisvert
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Stéphane Boisvert
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1 Solution
 
MikeIT ManagerCommented:
Need some clarification.  Is a user sending out an email and receiving an NDR back, is someone sending email to your organization and randomly twice a week gets an NDR, OR is your postmaster account randomly receiving NDRs?
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Will SzymkowskiSenior Solution ArchitectCommented:
Check the following...
- Outlook Auto complete caching email address
- Transport Rules
- Outlook Rules
- Possible application servers sending out email


Will.
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Stéphane BoisvertTechnical analystAuthor Commented:
Thank you for the reply
always the same user , do nothing and nothing in the Outlook sent folder but receive a bounced mail for sending a mail to a bad address, when i look in exchange log i can find the sent from this user, like someone sending mail under the "name of" to a bad address
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Stéphane BoisvertTechnical analystAuthor Commented:
Thank you Will for the reply

How can I find if is a application servers sending out email ? I suppose it need the access "Send As" for doing that
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Will SzymkowskiSenior Solution ArchitectCommented:
Typically, when you have application servers sending out email they are un-authenticated. You would check your anonymous Receive connector on the Mailbox Database server for Exchange 2013.

Will.
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Stéphane BoisvertTechnical analystAuthor Commented:
I looked my receive connectors and the Anonymous option is unchecked.
On my exchange server , there a log or additional information I can find ?
It seem to be always at the same hours, maybe a process or task ?
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Will SzymkowskiSenior Solution ArchitectCommented:
Twice a week one of my client receive bounce mail (sending mail to invalid email addresses) from exchange server

What is the exact message this user is getting? What users have Full Access or Send As permissions on this users mailbox? Is this user sending out an email to a distribution group and a user that no longer exists is present in the group?

Will.
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Stéphane BoisvertTechnical analystAuthor Commented:
Thank you Will for the reply
The message he receive is
 "This is the mail system at host mydomain.com
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
<The bad@address.com>: Host or domain name not found. Name service error for
   name=bad@address.com type=A: Host not found"

No "Send As" and no "Send on Behalf" right to this mailbox
Only Exchange admin have full access to the mailbox
 When I look the message tracking log on the server , I can see the sent is doing to one address not a group
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Stéphane BoisvertTechnical analystAuthor Commented:
I found by myself the solution
The client try to send a read receipt from bad address and receive an error of sending
I set the option ReadReceiptResponse at NeverSend with the powershell command
Set-MailboxMessageConfiguration -Identity my@address.com -ReadReceiptResponse NeverSend
Thank you guys for your help !
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Stéphane BoisvertTechnical analystAuthor Commented:
Find the solution by myself
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