Glenn:
Have a look at
Getting Started with fail2ban
Try the workup it suggests and then feel free to ask some additional questions.
I'd be happy to help after you have "gotten started".
Please let us know.
Additionally:
wrt:
Quote:
Originally Posted by glennbtn
occasionally something happens to the hosted site ad starts sending loads of email which bounces.
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Are you seeking to find the source of this activity?