?
Solved

Incorrectly spelt receipants not being rejected

Posted on 2006-11-21
7
Medium Priority
?
575 Views
Last Modified: 2013-11-15
Hi there, we have an exchange server here that accepts mail from 4 domains.
If a receipant address does not exist it gets rejected for all domains except for one where it gets queued in
'messages queued for deferred delivery'.
I then need to manually delete these emails.
Any ideas on this.

Thanks

0
Comment
Question by:tollair
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
7 Comments
 
LVL 104

Expert Comment

by:Sembee
ID: 17995783
Which version of Exchange?

Exchange 2000 cannot do this natively, you have to use a third party tool.
Exchange 2003 can do this natively, but it needs to be configured. http://www.amset.info/exchange/filter-unknown.asp

Simon.
0
 

Author Comment

by:tollair
ID: 18000475
I am running exchange 2003 enterprise SP2.
4 out of the 5 domains coming in will reject unknown receipants without the above being configured.
Its just one domain thats not being rejected and queuing on the server.
0
 
LVL 104

Accepted Solution

by:
Sembee earned 500 total points
ID: 18004009
If you haven't got recipient filtering configured in Exchange, then there is no other way of Exchange natively rejecting emails at the point of delivery. Exchange will accept the email and then attempt to send back an NDR. The message isn't being rejected at the point of delivery; point of delivery rejection is considered the best way to deal with misaddressed email.

Don't get rejecting the connection confused with generating an NDR. The processes are very different. Rejecting the connection using recipient filtering forces the sending server to generate the NDR. Accepting the email and then trying to NDR the message means that your server is doing the work.

If you don't have recipient filtering configured then your Exchange server is exposed to a NDR attack.

If the emails are being rejected immediately, with the NDR being generated by the remote server, then you must have something else on the server doing that rejection.

Is there any reason why you don't want to configure recipient filtering? As far as I am concerned there is no reason why you wouldn't want that option enabled.

Simon.
0
 

Author Comment

by:tollair
ID: 18005744
I have enabled this feature, there is still no change.
0
 
LVL 104

Expert Comment

by:Sembee
ID: 18008314
Have you enabled both parts? There is a setting in Global Settings and there is also a setting on the SMTP virtual server.
You then need to restart the SMTP virtual server.
I also strongly suggest enabling the tar pit, if you haven't already.

Then test it by telnetting to the server and attempting to send an email to a non-valid user. You should get an error back.
Don't rely on what the queues show you as that could be showing your old information. Exchange will try and resend email messages for 48 hours by default.

Simon.
0

Featured Post

Get free NFR key for Veeam Availability Suite 9.5

Veeam is happy to provide a free NFR license (1 year, 2 sockets) to all certified IT Pros. The license allows for the non-production use of Veeam Availability Suite v9.5 in your home lab, without any feature limitations. It works for both VMware and Hyper-V environments

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A couple of months ago we ran into an issue that necessitated re-creating our Edge Subscriptions. However, when we attempted to execute the command: New-EdgeSubscription -filename C:\NewEdgeSub_01.xml we received an error indicating that the LDAP se…
If you're a modern-day technology professional, you may be wondering if certifications are really necessary. They are. Here's why.
An overview on how to enroll an hourly employee into the employee database and how to give them access into the clock in terminal.
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…
Suggested Courses

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question