to check if sending email-addresses (mailbox-user) are existing on my server
this will decrease sending spam. else send data to dev/null
1
vote
![](https://secure.gravatar.com/avatar/7ce2f0d89f8d088d666fd3a246e7c526?size=40&default=https%3A%2F%2Fassets.uvcdn.com%2Fpkg%2Fadmin%2Ficons%2Fuser_70-6bcf9e08938533adb9bac95c3e487cb2a6d4a32f890ca6fdc82e3072e0ea0368.png)
Thank you for your input!
Unfortunately, we have to close your request, because over the years it has not become quite popular for further implementation.
—
IG