detlevp
If an error message as descriptive is that you will not be directed to the wrong path. The trigger was the error 552, for how many situations is this error code?
Sorry I do not understand you.
I will restate the question.
Earlier you said:
"It looks like that the entry in the SPAM filter was a problem. I have ruled out the zip files and the problem is resolved"
What was the entry in the SPAM filter ?
Where did you make a change eg in server manager, in command line ?
What change did you make to "rule out" zip files ?