NARDA,

Yes, that's possible, please however be aware that if you disable the generation of NDRs you will be violating RFC rules. Furthermore, if the sender does not get notified if an email is blocked, that could cause very bad problems if the email was a false positive, meaning it was a good email stopped by mistake. If for example one of your friends sent you an email to invite you to dinner, and it's stopped by mistake, you never receive it, and your friend does not know it was not received. Thus he goes to the restaurnat and you never show up... Usually users will not routinely go to their quarantine to check for spam email. If they did, they may as well receive all emails unfiltered as they have to check them anyways...

Also, please note that generating an error code during the SMTP transaction, like SpamFilter does, is what causes the NDR. It is *not* SpamFilter that sends the NDR email, it is the sender's mail server that does, you do not waste any resources by causing NDRs, you actually save them...

Also, more important, the NDR is in no way an indication that the address is correct. It is quite the opposite. If you *do accept* an email and quarantine it, it means that your are actually telling the remote server that the address is indeed valid, as the remote server will see it delivered. So not only you are validating that the address is correct, but you are also causing invalid addresses, like adhfggyret@yourdomain.com to be accepted. So now the spammer will think that *any* address it uses is a valid address, and they will continue to send even more emails...

Anyways, if you still wish to avoid NDrs, going back to your original question, please see the following option in the SpamFilter.ini file:

;Setting DoNotSendNDROnQuarantine to 1 will prevent generation of NDR when email are quarantined by causing SpamFilter *not* to send an error code when quarantining emails
DoNotSendNDROnQuarantine=0