Block return message - RecipNotFound

[Paulo97414]

Hello guys,

When I send e-mail to account not exist, I received messege from postmaster, like this:

Delivery failed to the following recipients or group

#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##

It's possible block this return message ?

[ShamilaGul58174]

Though the reason might be different but still you can contact with support. We recommend you to check the address. Such kind of problems do occur due to incorrect address.  

[Steflstefan]

You should not send emails to accounts that do not exist.
If you accidentally send an email to a non-existent account, it makes sense to be informed that the recipient address does not exist, doesn't it?
Why do you want to block the DSN?

Maybe it will help us understand what you want to achieve.

Greetings

[Paulo97414]

The problem is:

Sender is trying validate emails.

They are using script. So, they send the e-mail and If received the "Message error" they understood the email is not Valid.

[Steflstefan]

You should use the Directory Harvest Attack Prevention (DHAP) feature. After x wrong addresses, the listener will reject all connections from source ip for about one hour.

Grz