In the past we received a lot of spam email. The past year it was a lot less and we would like to keep it that way offcourse.
We are a construction company and we receive a lot of construction drawings which are big in filesize. The maximum attachment size we can receive is set at 25 MB.
Now we are facing the issue that there are still people which send us emails with attachments larger than 25 MB. Our server administrator has disabled non-delivery notifications on the server. He told me that enabling it would cause a lot of spam again.
So my question is; Is it true that enabling non-delivery notifications will cause more spam? And if we decide to enable it, what can we do to prevent that spam?