Recipient verification on Exchange 2013 SP1

Question

Hello,
we use 3rd party tool for antispam and I'm unable to configure recipient verification on Exchange 2013 with SP1.
Basically i have done all steps described in article http://technet.microsoft.com/en-us/library/bb125187.aspx and still i am able to send mail to non existent users (Exchange sends NDR)
My recipient filter config looks like this:
RunspaceId                 : a4ec4d9b-a68d-43e2-beb9-c397505d1321
Name                       : RecipientFilterConfig
BlockedRecipients          : {}
RecipientValidationEnabled : True
BlockListEnabled           : True
Enabled                    : True
ExternalMailEnabled        : True
InternalMailEnabled        : True
AdminDisplayName           :
ExchangeVersion            : 0.1 (8.0.535.0)
DistinguishedName          : CN=RecipientFilterConfig,CN=Message Hygiene,CN=Transport
                             Settings,CN=secureemail,CN=Microsoft
                             Exchange,CN=Services,CN=Configuration,DC=domain,DC=priv
Identity                   : RecipientFilterConfig
Guid                       : d34e78fa-bc92-44db-80bb-85e300135422
ObjectCategory             : domain.priv/Configuration/Schema/ms-Exch-Message-Hygiene-Recipient-Filter-Config
ObjectClass                : {top, msExchAgent, msExchMessageHygieneRecipientFilterConfig}
WhenChanged                : 30/04/2014 10:29:43 AM
WhenCreated                : 01/10/2011 12:34:08 PM
WhenChangedUTC             : 30/04/2014 2:29:43 PM
WhenCreatedUTC             : 01/10/2011 4:34:08 PM
OrganizationId             :
OriginatingServer          : server01.domain.priv
IsValid                    : True
ObjectState                : Unchanged
I have allowed anonymous connection on default connector.
Also, transport agent is enabled.
My problem is that mail gets in queue even i don't wanna this to happen.
Any advice is more then welcome.
Thanks,
Ivica

Answer 1

Hello,
well, we don't use Edge transport, we use 3rd party tool.
here is link from them:
http://helpdesk.spamtitan.com/support/articles/95349-recipient
important part:
"Once Recipient Filtering is enabled log on to the SpamTitan web interface. Browse to System Setup->Mail Relay->Domains.  Edit a domain and select "Dynamic Verification" and enter your mail server IP as the Verification Server.
This will allow SpamTitan to verify the recipient addresses of all incoming mail. 
Any mail addresses to invalid addresses will be dropped.  This will aid the spam block rate and keep your daily license usage count accurate."
But here is not issue with Spamtitan, it is with Exchange itself because i try to make it work via telnet session. 
I'm using scripts:
Set-RecipientFilterConfig -Enabled $trueSet-RecipientFilterConfig -BlockListEnabled $trueSet-RecipientFilterConfig -RecipientValidationEnabled $true