Exchange queue problem

Hi Experts,

I checked on my queue viewer, there are always a queue mail there which do not have a sender, return-mail.en-japan.com , deliver type:"DNSconnectoryDelivery" MSG source: DSN

is this a spam?

how could i prevent this?

Thanks
patcheahAsked:
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Milan_rCommented:
If the mails are coming from blank sender then it's spam mails.
To stop this check the spam filter setting.
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Simon Butler (Sembee)ConsultantCommented:
You haven't said which version of Exchange you are using  - however ensure that you have recipient filtering enabled. Where exactly you do that depends on the version of Excahnge.

Simon.
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patcheahAuthor Commented:
I'm using Exchange 2010, what kind of spam filtering setting i should configure? the confidence level? If i set the confidence level,im afraid it will cause some normal email treat it as spam.

Patrick
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Simon Butler (Sembee)ConsultantCommented:
Do you have recipient filtering enabled?

Simon
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patcheahAuthor Commented:
Hi,

Is this features at Edge transport?  We didnt install edge transport in our environment.

Patrick
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Simon Butler (Sembee)ConsultantCommented:
No.
It is part of the antispam agents. You can install it on a hub transport server. If you have content filtering installed then you will have recipient filtering available to you as well.

http://semb.ee/filterunknown

Simon.
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