SQL server 2005 Reporting services SMTP Email delivery issue

We have SQL server 2005 Reporting services, we are making use of local SMTP for relaying.

I am able to send mails using Telnet, but when we enable subscriptions on reports we get
Failure sending mail: Access is denied. error message, I checked in the log

ReportingServicesService!emailextension!f!05/22/2009-15:26:14:: Error sending email. System.UnauthorizedAccessException: Access is denied.

   at ReportingServicesCDOInterop.MessageClass.Send()
   at Microsoft.ReportingServices.EmailDeliveryProvider.EmailProvider.Deliver(Notification notification)
ReportingServicesService!notification!f!05/22/2009-15:26:14:: Notification 9f7bd5f3-0a3c-4461-8c5b-6ed0da20acdb completed.  Success: False, Status: Failure sending mail: Access is denied.
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in the reporting services mail config screen, try putting a known working username / password as the username/pw to connect to the mail server.  It's definelty security related.
MNASAuthor Commented:
In the reporting services mail config screen we are not able to put user name and password, it just accepts the from and smtp server details.
MNASAuthor Commented:
it was problem of access right on the SMTP mail pickup directory.

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